Im a 13 year old female and I am starting to think I might be bisexual. This all started a few months ago and I started to freak. I got really nervous around my best friend the same way I would with a guy. I told my mum recently and she doesn't believe me! She might be in denial but I don't know what to do

Just because you are nervous around guys, and now girls, doesn't mean it's about your sexuality. Maybe you should find out why you are nervous around young people like yourself period. It most likely comes down to how you deal with your new hormones. So do nothing about being bi, gay, or straight, even though your new hormones may have you thinking that way, and overcome your nervousness around PEOPLE. Actually you are supposed to be a bit nervous around some people, especially when you go through puberty process, which is nothing but your body changing (and mind and emotions), and ALL your friends your age are changing too, not just you.

Whether you are Bi or not it's just too early to tell, but during this time you are so nervous, it's more important to stay within the boundaries of good behavior, get your exercise, and sleep and eat right, while you are experiencing this life changing event. That may help with being nervous around people and may give you the confidence to get through this growth period. No your mom is not in denial, she just doesn't know if you are bi, or just hormone driven. She does know what you are going through though as all humans go through the transition from kids to young teens and the world seems to change. Actually it's you who are changing, and you who are pressed to deal with it responsibly.

You will have a better idea of both your sexuality and nervousness at 15, than you do now, so just be cool for a few years, and get use to the changes you are experiencing. Tell your best friend about you being nervous around her, but don't get too carried away and scare her. That's what I mean about boundaries of good behavior, because growing pains and curiosity are not worth losing friends over is it? Find ways to express yourself respectfully until you know for sure WHO you are and how you want to handle it.

Yeah, you could be BI, so what?

Thanks for the heads up. It helped me alot! You're right. I should just wait a few years and see what happens :). Other than that, thanks for the advice.