Hello, welcome to the forum.
Being bissexual is not a problem. It's a society's issue sometimes when people discriminate bissexuals or homessexuals. It's so better for you to know yourself and to realize that you are actually bissexual and try to cope with that and be happy, than to hide it from yourself and try to neglect that fact.
Try to gather around some other people, you may have common interests with some people, even if they aren't close to you. It can happen that sometimes you pay too much attention to your "friends", people that are actually hurting you and not listenning to you, than to the other people around.
Being an unwanted child is not a reason to be sad, embarrased or angry. It was something that happened and now you're here, okay? Many of us are unwanted children, for various reasons.
Cheer up and if you need anything or just to talk, you can pm me.