Anal masturbation...I AM SCARED!!! PLEASE HELP!!!?

I am 13 and I just masturbated anally, I used a toothbrush with vaseline on it for lube. It went in about 3-4 inches and the toothbrush isn't sharp or anything. but when it went in I felt a sort of popping. Is this bad? I don't have any discomfort or pain, I can poop and everything. No bleeding