19M How to make new friend group (Greater Toronto Area)

Hello, I really don't know what to do anymore. As the title suggests I'm a bit lonely right now, I am back from university for summer break and I'm a bit lost. I didn't really make friends at uni despite living on campus. I have that issue its hard for me to make friends or to really face uncomfortability in conversation. But in high school I was still able to make some friend groups of 5-7+ people which were always a blast. So coming back from a rough school year with nothing to distract me I have fallen in this depressive ass routine. Of doing nothing and occasionally getting to hang with one or two of my high school friends but mostly nothing more. I usually have to reach out and they are nice and all but its obvious they all moved on with their lives and it hurts since most of them went to the same uni and got to grow together. I know that's normal but it still hurts, even more now since I've recently lost my girlfriend of 2 years. I just want to know any advice to go out and organically make friends. I'm starting a mcds job so I have some hope there but I'm confused on where to find a "third space" or a place to meet people my age. I do wanna start some activities like skateboarding, drums or basketball but I don't know where to and I'm a bit scared since I would be a beginner at all these activities. Also I feel like I may have nothing to talk about since I also wasted my teens. Getting high (weed), playing video games, working out and school was all I spent my days doing so I feel as if I'm a bit boring and got comfortable and never really challenged my social skills. I'm pretty chill and doiwn for anything type but that's beside the point. Sorry for my little rant but I wrote this post mainly to get any advice on where to start or how to start making new friends, new social life and how to be more "free". You know be spontaneous going out to do anything and everything having that dynamic is all I yearn for these days that carefreeness. Or am I too old for that now? God I wish I'm not.

Any advice is welcome and thank you for reading.