What would you do if you're in my position

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I liked a girl and I want her to be my girlfriend, we've known each other a long time and I actually liked him since the first meeting but then she has a boyfriend so I hid my feelings to her but now she's breaking up with her boyfriend but many other men who loved and in fact I think she liked me and it seems like she also knew that if I liked her, we often argued and she was happy near me I think she's waiting to express my feelings to her, in fact I really want him but when I wanted to express my feelings to her I felt if I unworthy of her because I have a possible shortfall if she knows my flaws he might not like it, so until now I have not been say although sometimes I wanted to say and sometimes I think she will not be a problem with the flaws because she is very good and I look she is so sincere liked me but I feel embarrassed to say, I was very confused in my position now I need a good suggestion to solve it.