Depression. Depress because of my past?

I'll try to be brief. This is my past: Bullied by family and people in school. Mother taking her stress out on me by beating me black and blue since I was a kid. Grew up hating the world and myself. Turned atheist when I was in 4th grade. Never accepted by anyone but my father. When I was 13-17 years I was extremely short tempered and burst out in anger for little to no reason at all. Always felt like a looser and a burden for everyone around me. I've learned to live with myself since 2 years, I've been extremely happy and rarely got angry. But today I was pissed , don't know why. My mother said something that wasn't even supposed to be all that irritating but I lost it, I burst out in anger and punched the wall like I used to do in my teens. Am I still depress because of my past?