I don't know either. If you think you aren't from here, from where then? Currently you want to remember... But I must say, you need to remember first what to recall. Maybe that feeling comes from a yearning of another universe which suits you needs. Maybe, that feeling is an illusion which only you understand, because you made it, it only belongs to you so you'll need to manage that by yourself.
I would not be sure if I could remember something like that... Instead, I would try to write down anything I associate with that concept/feeling/place, then I would try to keep all of that near me, that would make me feel better for sure, and maybe trigger something inside of me that makes me remember what I think I forgot.
I reccommend to you to get into the dreams field (in general). There (and into your head) you'll find a lot of usefull information: How your brain physically works, and how your reasoning and memory interact. I'm into that since 2010 and I'm still a "Noob" so... That will take you some time for sure.
Welcome, I must say.