Why im i like this?

Hello Im Rae, in new to this website... i've been overthinking a lot and wondereing why noone sticks up for me or cares about me anymore... Today i cutted on my arm for the first time, it doesnt feel right... Sometimes i feel like people don't hear me anymore, im just someone there in the background of there main story... i have noone to vent to and i feel like i cant trust anyone...Also many of my friends lie to me and make fun of me, i hate it... One of them is so sensitive and becomes a vicitim of something so stupid and i was always there for her but now shes just a bi**h to me..I don't get why.