How to be yourself again?

I've been bullied a lot in the past and currently I'm still getting bullied this is just bringing me down and making me really depressed. I've been bullied so much and I'm used to being quite and being alone so much . I'm not like that I'm so much more fun and outgoing and now I'm so scared to act myself again my self esteem is low and I'm really miserable.PLEASE HELP ME? I wanna be myself again?