Should I see a pshychologist?

I have had an addiction for cutting my arms for months. I don't really see my friends after school, I like being alone. I have a MAJOR addiction to biting my finger nails till they're really sore...I have had a little bit of an "abusive past".. Also, I'm depressed a lot? I think I might have tried for suicide when I was younger and I used to sneak knives up into my bedroom before I started using razors for cutting.. The suicide thing was probably when I was 9-10 years old? I'm 11 now if that helps.. I think I like to inflict pain on myself? Should I see a psychologist or therapist? If I get enough replies saying I should, I'll tell my mom to take me to see one..And which one do you think is better? A psychologist or a therapist? And don't give me crap and lectures about how this stuff is bad or unhealthy. At least I'm TRYING to get help. And what you're saying won't help.. Please reply..FAST!!