Could I be depressed?

I'm 15, turning 16 in a few months and well something's going on with me. I am not one to self diagnose but I also am not able to seek out a professional opinion so here I am. For the past few months, I feel as if I've completely lost myself. I guess it started when this guy completely destroyed my heart (it's not the first time he has but it's definitely the worst) and this was about two weeks before my exams so I was constantly crying while also stressing over my tests and I just stopped caring, I mean yeah i studied a lot still but it wasn't the same. Then actually doing the tests, i would just completly blank and I didn't even care that I could've failed, I was just..empty. After that, things got out of hand and I went to a party, got drunk (which is completely out of character as I never drink at these parties), and the guy ended up being my first kiss. Fast forward a bit and turns out he had feelings for me but couldn't do relationships so instead he dated someone else, constantly flirted with my friends to upset and generally made me feel like I wasn't good enough (this has been happening for the past 2 years). Anyway, he's gone now to another school and most of my summer has been spent missing him and generally just trying to get through the heartache. I didn't fail my exams and I passed over to the next grade and of course i was relieved. Now, I still have summer but i am just not myself and my parents keep asking what's wrong and i don't know. -