If you are struggling to find people you feel like being friends with, I think that's very normal. I've felt the same way my whole life regarding the people around me irl. Rarely, I end up finding someone online like that and so we become friends lol. But if your issue is about not knowing how to befriend someone you actually do wish to befriend, I'd say just treat them like you'd treat any other random person, just a tad bit more eagerly.
As a person who’s been cooped up in my house for almost 6 years now, i totally understand you, I’ve always struggled with making friends around my age. My family taunts me about my unhealthy lifestyle, i stopped going to school around the first few weeks of lockdown. I’m 21 now and barely know how to socialize with people. A(๑•ㅂ•)و✧nd because of all this, I’m struggling with stuttering and social anxiety..i really shouldn’t have distanced myself from society especially from kids my age. Anyways i just want to let you know that you’re not alone and neither am I. And i hope whatever you’re struggling with, soon comes to an end and you get to experience whatever you missed in life. Have a great day! (๑•ㅂ•)و✧

Idk how to make friends as an adult. Right now I have no idea where people my age are at. I'm kinda stuck in a small town and am kinda wasting my 20s