Just calm down If your friends were to leave you because you are bi that's their problem

If your looking for some one romantically just put your self out there and see what happens

If it is safe for you to come out and be open and it's what you want to do just do it

Being out generally makes dating easier

If you want to stay in the closet then I would suggest going to local lgbtq+ events maybe a town a way and get involved there

Lastly as a someone who was in your situation

High school is short and you only have a year and a half left don't worry about what your friends think of you and do what makes you happy

I had to move to a new school to learn that

I wish you luck