Made a massive mistake😬

Basically I slept with this guy on Monday then slept with this other guy on Tuesday. I feel rlly bad and feel like I’ve lost my self respect and ive been feeling so down lately😕it makes it worse because the second guy that I slept with I only met him that day but he was nice and we r still speaking now🙂but I’m only 15 and feel like I’m making extremely bad decisions bc I feel like the first guy used me and now I’m an emotional wreck😭helpppp I need advice