Females opinion wanted. How can I build my self esteem and stop being so easy?

How can I build up my confidence. I just got over this bad breakup, and it seems like I'm too easy on guys I let them treat me really bad. It's probably from watching my mom all her life get abused and cheated on by my dad but she always went. How can I build up my standards and tell liars NO right away instead of finding good in everyone because that always screws me over. I also think I'm too dependent on men. People tell me you got a lot going for you yoru beautiful, your going to a university full time, and working at a nice job, but I don't think its enough why do I always feel lik I need a man?