I've been running for ~8 years and I was always pretty into it for that whole time. Sometimes probably a bit too into it because on days I couldn't run I would get extra stressed/frustrated and it wasn't great. I loved it and running was usually one of the highlights of my day, I was always looking forward to long runs and workouts, and it was all great.
That just stopped after cross country season last fall and I don't know why. It was my senior season in high school and I had a pretty decent season and there was no reason for me to stop being interested in running. My mileage wasn't insanely high, I wasn't overtraining, I actually sorted out all my injuries and nutrition problems and I was having a pretty great time overall, but I literally just didn't want to run anymore. My team had track this spring and I showed up to all the practices and did all the workouts and got a few PRs, but when I was running it just felt like I was going through the motions. I was never actually excited about long runs or workouts, I ran the minimum distances our coach told us to, I didn't ask to be put in multiple events in meets even though for the rest of high school I never ran less than two events in a meet.
I don't really know what went wrong. I'm not injured, I'm actually eating enough, my iron is normal now, I'm sleeping enough, I'm not overtraining (I took off 3 months between cross country and track just in case this was the issue). I just can't get into it anymore. I graduated high school last week and I've run maybe half of the days since then. Two years ago I would've run every single one of those days at a decent mileage, but now I just kind of shuffle around for 3 miles and then go home.
I'm not going to college on an athletic scholarship or anything like that so I know this isn't a massive issue, but running has been a really major part of my life for a long time. I met most of my best friends through running and I was planning to run in college with them but now I don't even know. Running used to be one of the only things that consistently made me happy, and now it doesn't even do that anymore and I don't know why. Any ideas?