How can I overcome my self created barrier?

I like girls and I don't really seem to do anything about it. I like butch girls and I am ashamed because I am worried about what other people think. The only person I am letting down is myself. I am the one left physically and romantically unfulfilled. I see some of those butch girls and I feel all tingly inside. I crave that feeling but yet I walk away from it. I wish someone would come and drag me out of my shelter, but i know that it has to be me who takes that step forward. I feels like for each step forward I take two steps back. But if I want to be fulfilled in life then I need to break through that barrier and get what I want. I am held back by my own perception of what other people think. This barrier is my own creation and I want to break through it!