Is it bad that I'm scared to do anything or go anywhere alone?

When I was in a freshman in high school some girls who didn't like me would follow me around and such. When I was a sophomore I got bullied really bad and a group of girls ganged up on me in the bathroom one time. When I was a junior I was in a bad relationship with a guy a year older than me but already out of school and he physically and emotionally hurt me a lot. So I'm too scared to go anywhere unless someone I trust is with me and I don't like to be away from home long because I'm afraid something might happen. I always have to have a person or a pet with me if I'm doing something because otherwise I start freaking out. Is this a bad thing? What should I do? Should I continue the way I am?
Is it bad that I'm scared to do anything or go anywhere alone?
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