Just talk to people. Take a walk, so hi to everyone you pass. You need to act out the type of person you want to become. It's a muscle. Those interactions are easy because they are almost always extremely ephemeral. Hi & hi, maybe a conversation starts up about something in the direct area, most of the time it's extremely quick. Maybe you even see the same person multiple times, the very fact you both take walks at the same time is a connection you can build on. Conversation builds friendship.

Then apply this muscle to less ephemeral situations like the coffee shop or gym or whatever, where a group of people are in the same general area as you for extended periods of time, with their own demands on their time, likely there studying or exercising or whatever. When they get bored studying or exercising for a bit, say something to them. Like "Yo what's up, just studying?". Are you worried about how you "sound"? Or if you are saying "the right things"? If you are work on letting go of that. It's a huge weight on your shoulders.

Also, if you're working. Start pinging people. People love talking about stuff they're interested in. I do it and learn all about all the crazy hobbies people have. I've actually taken up hobbies myself as a result of some of these interactions because I met some /extremely/ dedicated people.

It's fucking easy man. Just do it.

With this tactic I guarantee you will have 100 interactions in no time.