Is it normal to like someone and not able to talk to her?

Ok so this is my story before anything I would like to point out that in these sort of situation I like to point out that I think of myself as a caword and a wuss I I'm trying currenly in progress working on resolving both problems. Ok so I had this crush on this awsome girl who I known for a while (5 years). We were close friends in elemantry school. and since we separate and met back I haven't been able to talk to her and I'm not sure if I should because honestly she very happy as she is. She has good friends not bad people (but they don't like me Idk why but I kinda think its my own fault) she's funny, a little hyperactive and random, fucking smart and beautifull and she has a good hart. I see her everyday everyone likes her and she's talented and stubborn but I kinda like that don't know if I should. But still I want to be in her friends list and hangout with them because I never do. We don't even talk in class. And I cought her sometime looking at me than whenever I look back she turns so that I don't see her see me and whenever I talk to her I dissapoint her but I don't want to keep dissopointing her and athore thing is that there is this dude who likes her and she likes him back but I idk how but he hurt her and I think she wants him back but just to scare to get hurt again. So here I am -.- I don't know what to do can I have some advise here????