Dating new friends
I have many friends who have met their significant others using Bumble- so maybe give that a try instead of Tinder.
As for dating, I find it hard to believe in this day and age people think going to the bar and trolling for randoms is going to be more fruitful than dating apps, but.... Your post to me reads more about the disconnect between your expectations and reality - meaning, the difference between how easy it is to make friends when you're in situations (school, work, etc) when you are around people quite a bit, and/or they are in a similar situation (wrt needing new friends) and how much effort is required to break into other peoples existing social networks such that you can develop a meaningful relationship with that person.
Here's what helped me: Live in a very social apartment complex. I can't help with dating but yeah, it's a lot easier to meet girls with other friends so it doesn't seem creepy (why oh why does this have to be a thing in modern society? You just have to let things happen naturally or be ok with lots of people giving you the cold shoulder.