So at one point I was pretty positive I was gay. Then I was roaming around wikipedia and other sites about OCD (because I'm slightly ocd sometimes) and read that straight people with it can sometimes think they're gay, and vise versa. I can still imagine being happy with a woman in the future, I'm just not sure if that's actually me or the slight ocd, or completely confusing myself into thinking something else. I might have also thought I was because I have many gay friends and live in a pretty liberal place. So, I'm back at square one. I've sorta kinda dated a couple guys before but have also had girl crushes, ish. Maybe. Basically I'm not sure of anything again, which is frustrating.
The internets will drive you as crazy as you'll let them. Only you know your experiences, but it'll take time to develop a strong sense of your sexual orientation. Meanwhile leave yourself open to experiences guided by what your heart tells you, and don't force it one way or the other.