I need genuine help:(

I want to break up with my partner but i dont know how to. Ive wanted to for a while now but havent said anything, theyre a great person and have done nothing to make me hate them, but i just think ive fallen out of love. I feel so horrible for it. I dont want to prolong/keep pretending im okay with this bcz i know if i keep this up longer itll hurt both of us more. I know its going to be awkward, we go to the same school... ugh plus sending a long text sounds shitty and cruel but i cant do it irl, ill just chicken out. And another reason is I think I don't like girls and I think im a boy who likes boys and i hate myself for it. I dont know what to do, i asked for some space and havent been talking to them for almost a week and the guilt is eating me up. I should say something. Do something. But i dont know what to ssy or do anymore. I need help.