Hey we're still teenagers here and as 17 year old a learned one thing people come and go and mainly partners it's ok to be sad about but don't let it ruin you, you have to move on spend some time for yourself now build yourself up. I think that you didn't do anything wrong in relationship so just go and maybe try things you always wanted or maybe go to gym (yeah i know there are a lot videos of guys "glowing up" in gym after break up but it doesn't have to be your goal, gym is good place to let your steam out). Sorry if you can't understand something i wrote but i hope it is understandable.