I'm not sure what to make of this dream. I'll try and explain it in full detail, to the best of my recollection, and without too much clutter. This dream is coming from a recently depressed, confused, and lame person.

In the dream:
The dream starts out, and there's a party. I'm in a place that resembles my grandparents old house near a beach, and a lot of my relatives and other people have gathered here. I was sitting down by myself, and there was a large crowd of people mingling with drinks, talking with each other. A girl comes out of the crowd, one I've never met. She starts flirting with me, and neither of us try to hide the fact we like each other.

In the real world:
I've never been approached by a girl in this way, and have never approached a girl myself. I always have doubts, and lack motivation and the initiative to try and get in a relationship. No girls have ever shown affection, so I settled with this fact and accepted it. At school, I took a liking to a girl and was working with a friend who knew her to try and get to know her. He gave me her number, and she knew I was going to text her. I did, and we exchanged a few messages. I was always the one to message her first, she never did.
One day, I worked up the courage to message her again past all my doubts, and carried on a nice conversation. At one point, she never responded. I never heard back from her and gave up. Days later I found out she'd be going out with another guy. This is where my depression and hopelessness for the situation sank in.
Recently, I did some soul searching, and found that a cause of my depression was that I held on to hope too much. I forgot about all of it, and each time I felt hope I dismissed it, and found some kind of happiness and content.

Back in the dream:
I told the girl something of the situation above, how I had given up on relationships and blocked some emotions to be happy and to better myself. I told her how I'm usually a quiet and reserved guy. How I don't talk much, and how I'm usually bad about showing much emotion. She was okay with this, laughed, and accepted me as that, but she would help me change and lighten up. She taught me how to dance, and we laughed and had a great time. I felt that very special kind of happiness in my gut you often feel in dreams, where everything seems right.
She gave me her number, and told me to text her. At time point, I remember some brief flashes of us wandering through a local grocery store. I don't remember what happened, but the fruit/vegetable and drink sections seem to stick out as us being there.
Next thing, I was sitting beside my bed, plugging my phone into a charger to text this girl. I sent her a lengthy message, I don't know about what exactly, but probably about some of the things I told her. I never got a message back from her. Somewhere in this dream I felt very depressed and hopeless.

Later, I was in another dream. I was driving a red convertible in third person with a friend. It felt like one of those cheesy arcade racing games, where the steering wheels are very unresponsive and like to jerk the car around. We were the only car, driving down a road on a cliff, with a coastal town in the distance, and no foliage, just tan dirt on the side. Up ahead was a strange rock formation and a cave. The cave was the mouth of a man with many chin wrinkles, but not necessarily obese. His mouth was open wide, and his eyes were wide as well. I poked my head out the top, and laughed at it with my friend. I said something like "He's Asian!".
We continued driving down the road, and suddenly I felt the presence of other people behind me, as if I was actually sitting in an arcade chair. The steering wheel jerked and I lost control, and drove off this cliff. We tumbled and turned, never feeling the momentum. Every once and a while, I'd gain control of the car after landing a flip, still falling down the cliff, and managed to drive it down the vertical surface, trying to gain control.
More tumbling and rolling down this massive cliff, we landed on the soft sand of a beach next to the ocean, with this white, coastal town in the distance. We stepped out, suddenly first person, unharmed. I looked at an object near the water. It resembled a child's white board toy. The frame was white with colorful shapes on it. There was a handles and pen attached by a cord. I felt this object had some connection to the girl I met. I don't know what, but I thought we might have played with it or used it to communicate. I wondered what reason would lead to it washing up on the beach. I wondered if the girl had gotten into some accident and the toy fell in the water, or some other odd reason. I felt confusion and sadness.

I don't know if this dream has any real significance, but when I woke I felt very strongly about it, and remained in my head all day. I remembered that feeling of happiness I felt, and the connection to the girl. I was disappointed to find out it was a dream (as normal), but I felt I should continue holding on to hope. For some reason I was thinking I should wait, and that I'd meet this girl later on, but laughed at that thought.

That's all I can remember from the dream. I can try and provide any more information about the dream or myself if someone asks. This is all I thought to write. If something isn't clear, I can try to fix it. My explanation may be very cluttered. At the point in life I'm at, I'd just like to know what this dream means if anything, or if it's just another tease of happiness.