Feeling too insecure & cant approach

When I was 12, people keep bullying me because I was fat & ugly as girls just walk away from me when I talk to them (bitches). As this keep happening everywhere (the bullying bit), I was forced to change schools (already 3 if my memory serves right) every year. So I planned to change my ways as I exercised regularly with good diet which changed my physical appearance to a muscular guy. I also focused on my studies which for now I excelled every subjects I have taken. As for now I am 17 & everybody in college likes me (interestingly). Guys get jealous of me, girls want me to date & marry them (some of them) blah blah but because of the bullying I suffered since small I am still insecure about my looks & physical appearance (basically a shy person & over insecure) & even if a person comment on my looks my confidence I would be shattered (never happened but I know the impacts of it) How could I overcome this problem? I couldnt even ask my crush to go out with me (I prefer to ask her out myself not vice versa). Plus, she is really a very sweet person (she is kind everyone she knows & treats them the same way) & I know she will eventually reject my approach (she also focus on her studies seriously & other guys have tried it before ; they fail badly). Besides that, the only reason she hangs out with me is because of her cousin (we are good friends) & also because I am really smart (she asks my help every time). Please give me advice on this & not insult me. Thank you :)

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