Think I'm struggling with anxiety but not sure

Hi, My name is Lindsey and I feel like I don't matter to anyone, I feel useless, and very insecure. My sisters are talking bad about me, saying that I'm hideous, stupid, fat, retarded, and many other things. For example, just yesterday my big sister got pissed for what seemed like no reason and told me to go kill myself. As a result of being bullied for my whole life I've started believing everything that others say about me. It's been months since I've been feeling this way, and been trying to hide the way I truly feel.

P.S. I've been thinking of talking to my mom about this and asking her if she could get me "someone to talk to," but I am to timid to ask.

Btw, I'm the one on the right side and the woman next to me is my mom

This is another picture of me just in case you guys wanted to see me a bit better