Mann.. Seems Like you've been hurt alot..
I understand how you feel.. My Family sometimes do that. But life has ups and downs..Your 19!! lol Im sure you have many things to look forward to.. All i can say is live it up girl!.. You choose to smile or frown each day.. Do something new.. Dont get hurt by others even if its your family. Know what you wanna be and do.. and do it.

Hope it helps