Seeking Help??

I really want to see a psychologist about my problems. A while back when my mom found out I was cutting I went to a counselor, and it helped a little bit, but she was basically a school counselor. I want to tell my mom that I think the things that are wrong with me aren’t temporary because sometimes they go away but they come back pretty regularly. I’ve felt pretty awful mentally for a long time (probably the last three or four years) and I don’t know how to tell my mom that I want help. I feel like she won’t take me seriously, I’ve mentioned something about it to her a couple of times and she just kind of dismisses it as temporary, I’m “just feeling a little down”. I want to get help but at the same time I don’t really want to tell her everything because the only things that I could tell her that might make her believe me are things I don’t want her to know. Even if I did tell her she’d probably just tell me I’m exaggerating. I really don’t know what to do.