I can't express myself?

I've always had a problem expressing myself. I try to draw, and I don't enjoy it because it looks crappy..I try and write, and I just hate how I write. i play guitar, and nothing good comes out(I've been playing for 7 years...I don't suck...I just can't make my own stuff up without hating it) I can recognize good art, literature and music and always think(especially for lyrics) "why are my lyrics so much more awkward and don't fit together(it's more bursts of feelings that I can write). it's not only through art, but also just thinking and speaking on a daily basis...I'm horrible at explaining things and I realize what im saying makes no sense. Like, I enjoy having big universe talks with my sister, and when I explain something she can put it together for me kinda because usually when I explain what I'm trying to say it sounds dumb. So basically I can put things together in my head but I just can't express things effectively and constantly have writers block I guess. and I also observe people all the time and watch their reactions to situations because I find people fascinating and I know why people do certain things because I creepily observe so much...That is literally the only thing I'm kinda good at... Is there anyway I can express myself better? Or do I have no chance at ever being artsy?