How can I tell my mum im bi and why am i so scared?

Its perfectly normal to be afriad of telling family. Its probably because on TV, or in the media, wherever honestly, they put it out as if being LGBT is a bad thing, which its not. Your bisexual, so you would understand that it isnt our choice, were just being who we are. I know that nothing I can say is going to stop the fear. Ive been there. The only thing you have to do is just tell them. The fear will be gone and it will feel like a huge load just got lifted off of your shoulders. Good luck! (: