I can't come out to my mom, she'll think it's just a trend.

I've been friends with my one friend, let's call them Gary, for years. Gary has recently (last year) come out to our friends and I as pansexual and gender fluid. I wasn't sure how to think about it at first, but I was fine with it. Over the year Gary has made me consider my own sexuality, to the point that I've figured I'm either bi or gay. (Hard for me to say, because I haven't ever really had a crush on anyone I've met.) I haven't told Gary, because he'll without a doubt accuse me of just copying him. (He's just that sort of person.) I've also told my mom about Gary and his changes over the years, to the point where I've spoken about it so much that if I tell her I'm not straight, she won't believe me and think I'm just trying to be like Gary. I have a lot of LGBT friends, so she may believe I don't actually like he same sex. (Again, I'm not 100% certain about my sexuality, because I've never been attracted to anyone, oddly. But I wouldn't turn down a date just because they are the same gender, that's for sure.) Anyway, advice please? Thanks in advance.