Struggling to feel happy

Hey guys, I hope you guys can give me some advice on what to do. I have a lot on my plate and it’s hard asking someone for advice, so instead I’m turning to Reddit for some anonymity.

I am a 19 year old man, and I am a rising sophomore in college. I am struggling to find happiness in my current situation.

I go to school across the country from where I grew up. I didn’t know anyone when I arrived on campus, and have made a few friends. However, I have barely heard from those friends over the summer, despite my best attempts to reach out.

Last summer was super hard for me. I was going through a really tough break up and I’m still struggling to move on. We ended on good terms, and our split came due to extenuating circumstances, and not a loss of love (you know, end of senior year breakups when you guys are going to different colleges in the fall). She has recently started dating another guy, and I still feel guilty talking to another girl. Some days are better than others, and I hardly think of her. But some days get me. I hear a certain song, or see a certain photo and it screws me up. That is all contributing to my depressive mood.

During last summer, I started running. I did my first half-marathon in the fall and won my age group. The injury bug came soon after, and long story short I needed surgery on my lower back to correct a herniated disc in March. I spent the entire second semester of my freshman year in physical pain, and had to miss out on a lot of stuff. I am still dealing with those problems, and this lingering back injury has prevented me from doing anything this summer. I can’t go to the gym, can’t run, can’t work, can’t do much of anything except sit on the couch and watch baseball. Because of this, I have felt even more disconnected from my friends, my family, and the things I enjoy. In the past, when I’ve had hard times, I’ve been able to lean on exercise and the outdoors to help distract me, or soothe me. But now, I have no choice but to sit and feel bad.

I’m feeling helpless, scared that my physical pain will never go away, and isolated and alone. I don’t know how many people this will reach, but I hope someone else can give some words of wisdom, or something like that to help me stay motivated and positive, as it’s really hard for me right now. Thank you in advance for your help!