How do I tell me my about my depression!!

Okay so I’m pretty sure I have major depression and I really want to seek help for it or just go to a doctor to actually get diagnosed. I just really want to start feeling better but idk how to bring it up to my mom. I’m 18 but Idk what doctor to see for it or how to even get help for this. My mom has always been super awkward about stuff like this and I have never told anyone how I feel bc I hate acknowledging it. What should I do??