I need some advice, does she like me back?

Yeah lol, just another confused lesbian here in need of advice..
Well I've always really liked this girl and I've got this huge feeling that she's gay, too.
Like for example, she's always acting a bit 'too straight', if you know what I'm saying. It's almost like she's trying to cover it up. She doesn't act like a normal straight girl, she kinda mentions guys so much that it's unnatural, and tries to act like she's straight and stuff.
She's also always trying to find excuses to touch me. At first I thought she's just the type of person who does that to everyone, until recently I realized she's always touching my arms and putting her hand on my knee in ways she won't really do with anybody else. In fact, I've noticed that she doesn't really touch anybody else at all, unlike what I previously thought..
I heard there's this "look" a lesbian might give you in her eyes that's like a spark or something, and apparently it shows that they definitely like you that way. At first I thought it was complete BS and is exaggerated, but I think it has happened between me and this girl before. The problem is, I don't really look anybody in the eyes because I've always had trouble making eye contact my entire life. I guess I'll just try next time or something lol. I was just wondering is this eye contact thing really true??
Anyway, sorry for the long explanations. I just really have this feeling, almost like a sixth-sense, that she's gay... What are your opinions? Do you think she really likes me or am I just over-analyzing? :help: Thanks so much.
PS. She's knows that I'm gay, I've told her before. And she's aware that I've dated other girls in the past. She says it's really cool and she has no problem with it, but I haven't directly asked her yet if she's gay too and I don't think I plan on asking her that anytime soon. Just wanna give her some hints to let her know and see where that goes