depression?

I've felt really down for the past couple years and parents/friends have told me it's just a phase and it's just because of school or different stressors. I totally get that, but I never really feel happy or excited for anything anymore. growing up I had a really hard time making friends (still do to this day) and once high school started, I made friends ok but none really stayed around for more than a year at a time. I've tried eating healthier, going out more and going to the gym which has helped a lot but I still have moments where I know I'm supposed to be happy or having fun but I either can't make myself be in the "right mood" or relax enough to try and enjoy anything. I don't intent to bring myself down in front of my friends but I guess I do it a lot because I remember a friend once told me that I talk more shit about myself than she has heard any one talk about anyone else I can't help but feeling like my friends and family are moving on with their lives and enjoying all the parts of it, but I am really not and it feels like I am almost stuck. I just want to be able to enjoy my life and university but am unsure of how to do that. I would really appreciate any tips or advice. My parents have told me before that this is just a phase in my life and it will be over eventually, but I started feeling this way in about grade 7 so I'm not sure if I'm just supposed to wait this out and hope for the best or what to do...so here I am🤷🏼‍♀️