I need help

I am in 8th grade. Recently I’ve felt so left out and that everybody hates me. I do dance and I’ve had to miss many dance sessions due to school work therefore I am only in a small section of the recital piece that they have been working on. Because I haven’t been there I don’t feel accepted by the other girls. Last week after I had dance I cut myself. Tonight I told my parents that I didn’t want to continue dance bc of reasons like not feeling accepted, only being in a small part of it, and being embarrassed bc they r all better than me which r true but I left out the underlying reason. Should I tell them abt this and if so how do I go abt doing so?