SP shouldn't feel like anything entering SP can be anything from feeling nothing to feeling like a roller coaster.

You probably were paralyzed at the end of your dream because you were waking up and the mind was getting messages from the body and they were conflicting with the ones made by your dream. Real inputs have precedence over dream inputs.

Congrats on your lucid, I'm sure that you will have many more, don't worry if the first few are short and boring, they'll get longer and better