I need some advice

Hi ladies!

So I just need some advice on how to tell my mom something.. to back up my dad passed away almost seven years ago now, a year after that my mom dated a guy who was really..not good for either of us for two years, eventually they broke up and I started to get sexually harassed (physically and verbally) at School a lot (which is a problem that still happens but not something we talk about because it’s something my stepfamily laughs at me for) anyways.. In my health class we had to take a self assessment about depression, and I scored a moderately high score in the severely depressed sector.. (40 the highest (most depressed) score being 60) I’ve been wanting to get tested to see if I actually have been struggling with depression for about two years now? Every time I bring it up my mom kinda shuts it down and since I’m a minor I need her to be okay with me going in/paying for it.. any advice on how to bring it up? Sorry I just I really don’t know what to do at this point.. thank you so much, anything at all helps 💕❤️