Feeling like i dont belong in my family?

No family is perfect. Growing up with siblings is always hard because as much as parents deny it they do have preferences among they're kids...in other words they have favorites, and siblings always gang together. So I think growing up in that household has made you timid, you just need to break away from that and be yourself. Don't harm yourself just be strong and try to find a place among people you have something in common with. I'm sure you're a great person and just keep being yourself but don't hold grudges against your family because it will tie you down and make you feel worse. Try to focus on the good things about yourself and life and I'm sure you'll make it through