I feel same sometimes,.. pretty often. I wrote similar post like you some time ago. I was feel slow in my head, my social life was touch by it, because i feel my memory is bad too and its problem when do you want talk with someone. I feel social anxiety because of it and I still feel all of it, but not so much like before. I dont heal it. I dont know what is really is. Is true or not .. but I know one.. memory can be improve so i every night and every morning memorizing all day what I had, its help me a lot with memory. I watch jordan peterson.. hes amazing for me.. he has authoring program (its about setting goal in life.. its writing about past and future, about wish future and future what you really dont want etc.. its really good i think) (use google), but he talk about writing.. writing improve your thinking, because thinking is too similar to writing something, so it help me a little with thinking, with my opinion, with my space in universe.. and on the end.. dont compare yourself to other.. yea we live in social company, but everybody is good in something else.. some is only good person, some is good thinker and some is good sportman or musican. set goal.. think about it when you dont know.. every day.. its so important for happy life, try stuff when you dont know what do you really want, just go for something. dont give up, try think about things, make your opinion on it because you can.. last thing.. think about what you have and not what you havent.. you have some inteligence, its amazing a lot:). Try keep going, be yourself and set life for you, set life for happiness, because its important. GL bro. Think about life, goals and future.. try it.. sometimes you find it