1 important Question! Take serious please?

Firstly, I'm not 100% sure, but im a boy and I think i'm bi well atm, and i really dont wana, im more straight though as I was children when im older but the thought of the tihn yuo know yuk and i just want to be 100% straight :(! but deep down I know im straight it's just not showin it yet, what can I do?