Sophia, bisexuality as with any other sexuality is just about who you love and if a person is a true friend then as far as I'm concerned the only judgement they should make is one of approval and support when you find yourself in a happy, safe , loving relationship not a judgement on who that relationship is with x x
Sadly some people in society don't see this yet but there are plenty who do so I'd really recommend you seek them out and make some good supportive friendships and I hope things get easier for you *hugs*