You know, what I've learned in life is that 'family' is the people who care about you, who are interested in you and vice versa. They could be teachers, neighbours, colleagues, friends... isn't that what 'family' is all about - a sense of connection, of belonging?
If there's a disconnect in your 'bio family', maybe it's them... a little dysfunctional. The way to move on as you live your life is to find 'family' people and create your own.
Never worry about what could have been/should have been... because it isn't and it wasn't.
Think positive and go forward and never mind those who don't/won't/didn't/can't understand you. Your life is all about YOU and what you make of it. Stride on ahead.