Looking for help! Desperate to achieve lucidity! D:

[nettlebeast]

I'm 20 years old now, but when I was younger (from when I was about 10 or 11 to about 13) I used to be an avid LDer! I remember picking up a book about lucid dreams at a bookstore, and being a child, and thus open to everything, I decide to try getting a lucid dream. It's hard to remember that far back, but I do remember just going to sleep with the aim of having a lucid dream, and I just /did/! It came naturally! Then, for whatever reason(s) I stopped engaging in LD's, perhaps because my life became so much busier as I grew older and I just forgot about it. Recently, I've been wanting very much to get back into lucid dreaming! Unfortunately, I can't seem to do it the way I did when I was a child! It doesn't just happen anymore; maybe I'm overthinking it. I've read many beginner's tutorials in an effort to train myself, and I've tried many techniques (I now carry a marble with me everywhere I go for RC, I use mantras throughout the day and before I sleep, and I go to sleep with the resolve of attaining lucidity) and I just CAN'T do it! I end up just falling asleep and dreaming normally. I then wake up in the morning, look at the sun coming through the window, and I'm just like "OH COME ON. Not again! Another night of no success at all and I don't even remember falling asleep." D: I even tried the WBTS method a few times (on nights when I didn't have college, that is!) and I went back to sleep determined to have an LD, and ended up just slipping off to sleep without remembering it, same as any other time. What am I doing wrong? Why can't I seem to lucid dream no matter what I try or how resolved I am to LD? I'm so glad I have all you guys on here to talk to, because I certainly can't ask my friends for advice on this particular topic, they'd think I was a little crazy, aside from not even knowing what I was talking about! EDIT: I also keep a dream journal.