Getting Help

For the past few years of my life I have felt very depressed. It hasn't gone away, and it just keeps getting worse. I also have really bad anxiety and get stressed about the smallest things. I feel like I need to tell my mom about it, as it has been starting to cause my grades to drop. I've lost pretty much all motivation to do work, and it really doesn't help that I'm stuck in the closet because my parents are extremely religious. I want to tell her how I feel so maybe I can get some help for myself but when I try I feel like its not worth it and I get really anxious about it. I don't know what to do anymore.