And I may act a little like I'm "off" up here sometimes, what does this sentence mean?

Question

I want to know what this sentence mean in simple English

Answer 1

Without further context to add, I would have to say that the writer/speak/narrator, at times does not feel to be in full console of his mental faculties. Sometimes he seems a bit “off ,” meaning that he doesn’t always feel like he’s in his right mind. “Up here” gives the reader the since that the speaker/narrator/writer often feels isolated, and that can be. Contributing factor as to while he does not feel he is of sound mind. Again, with just a few words to use to analyze, this is a best effort educated guess.

Best wishes.