I think what your referring to is if you want to express your feelings to someone you like, isn't it.
That is not easy and usually takes a bit of challenge as you may lose even the friendship title if something goes wrong. It's a really scary thought. But just try it, think of it as such. If you don't do it, other guys may do it. The sea is huge, there are lots of fish. This will be a stepping stone. Many people don't dare to step out of their comfort zone and end up always having that fear. Face it and feel the pain now rather than next time.
You will definitely find someone who would one day cherish you. Try to hit the gym and ask someone what's the thing that you have got to change that makes you more attractive. The reason why she's attractive to you is that she has done lots of work to her appearance or character development.