How can i start thinking of myself better?

Im desperate!! I have been through several guys and they have all used me, abused me ect. Well i finally have this amazing girlfriend and she loves me to pieces. We are in love but no matter what she does i keep going back to my self destructive ways.... what do i do? I keep hurting myself physically, emotionally ect. I want to stop. Im on meds and have been to several facilities for this. I want to love myself but the most i think of myself is as a good friend and the s_h_i_t. Like cool. I really love this girl and want us to be even happier- and one way to do that is to love myself and be happy with myself. How do i do this?