I need some help.

Tabby
Hello everyone I am 13 years old about to be 14. I am not sure if I am pregnant and I have never had sex. I think I am from my bone marrow and I haven't had my period for 2 months now. I'm afraid to tell my mom. I'm also afraid of going to the store and buying a pregnancy test. I took this picture to show y'all how I look, and to me I look pregnant. My stomach has gotten hard and rounder.