My lesbian friend likes me?

I have a friend who's lesbian and she flirts with me non-stop since I turned 16 (she's 17)
I've known her for 4 years now. Sometimes we don't get along but we still hang out because she's fun to be around.
For the last couple of weeks, she really pushed her feelings of how attracted she is to me and last night she asked if i'm willing to turn lesbian "too" and I told her im as straight as a ruler, but she's still flirting with me!!

I swear I really don't know what to do or act.
When a person is attracted to me and push their feelings onto me and I don't feel the same for them, I get very distant and stop communicating with them (i'm really just not interested in staying friends from that point). I don't want to become distant with her though (even though my heart wants to) because she'll be a loner at school and I'd feel like shit.

Anybody else experience this before?
How the hell do I make myself feel comfortable around her again?
I don't even want to hug her when I see her because I normally don't hug people who push their feelings onto me when I don't feel the same for them.
My lesbian friend likes me?
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