You know, I think your idea of feeling like an alien, and having a hard time finding the right kinds of people, is interesting. Yeah, feeling alienated is normal when your life is changing. You simply haven't gotten to try out the new options available to you. And it's ok, because if it where easy you'd've already done it.

Maybe try something low-key to find other people to connect with. Maybe a hobby or two, or get into a fandom of a tv show or movie you like, and chatting online for a few weeks just to get the feel of your new normal with people, then chatting IRL. I know how hard it is to deliberately try to make friends and the let-down if it doesn't work is awful, so if you just aim to share interests you can get two birds with one stone: having a hobby to motivate you and put your new energy into, and getting used to interacting with non-depressed people. Maybe friends will happen too.

And at the very least, you are having a chat with a non-depressed person right now. I used to be depressed. I know that other side. I highly recommend the happier, more energy, give a fuck side.