Coming out advice? Really need help and have no one to talk to.

So I'm a freshman in college. Obviously, I'm gay but I come from a conservative family so it's just me hanging out in this closet. I meet my roommate about four months ago via text. Practically his first question was if I was alright with a gay roommate. I said I was fine with it. Now four months down the road and after spending time in the dorm, I feel actually bad for lying to him about the fact that I'm gay. I can sense his level of discomfort in the room because he never talks to me but talks to others on our hall. I really am thinking about coming out tonight for the first time ever. The idea scares the shit out of me. It makes me want to throw up. And just writing this I am shaking. I need an opinion on if I should do it and how. Honestly my best idea so far is to write it down and leave until he texts me.TL;DR: roommates gay, I'm gay. He doesn't know. Thinking about coming out. Never done it before. Please help.