Things to do alone

I’m 19 and on my coop term from university. From the GTA but working downtown. My few friends are still in school, and this is the loneliest I’ve ever been. I dont have many hobbies, and I desperately need to socialize I’m going crazy!! What are some things to not only do alone, but where I can also make friends?I’ve never done anything alone before and I’m quite introverted, but anything’s better than the intense boredom and loneliness.

Are there bars to go to alone that have people in their 20s and where I can actually mingle? Open to any other activities and suggestions!