Should I tell him? or let him find out for himself?

i've kinda been strugeling with my sexuallity for a while. for the longest time I said i was lesbian mainly because of the fact that i was straight up afraid of guys. don't get me wrong i am very atracted to girls just afraid of guys. so now i met this guy who really likes me and i really like him. so far I've been able to talk to him like he's been my friend forever. I've been really honest with him, but i kinda want him to know about being sexually confused and my self injury because we're getting kinda seriouse. I just don't know if i should tell him now, wait or, let him find out eventually. I'm trying to stop, but the longest i've bad it is a week and a half.... what should i do? and when is the right time to completely open up to someone? I care about him, that's why i want to be open with him... no skeletons. But i don't want to be hurt by him after i spill my guts. what to do, what to do? and if i do tell him should i tell him in person, or is texing ok? I just don't want to mess things up with him... HELP?