I don't think it is too much. I did the same thing for several years, reading everything I could. I still like to read psychology, but I don't feel the intense need to read it.

As my T said to me, therapy is not easy to do, or to understand in the way we can fully understand other things. Reading about it can be a way to show a desire to understand it, to figure it out (and it seems that figuring it out would naturally lead to figuring us out), to resolve the tension that the mystery about it creates. It makes sense we want those things.

Reading helped me understand myself, helped me see things to talk about in therapy when I wasn't sure what to talk about, or I was worried that some things were more worthy of talking about than others and that I would talk about things that are not important and been seen as shallow or boring or stupid. (I still struggle with this)
Along the same lines, reading also helped me see what was considered psychologically healthy (and not) and how development and attachment work and why attachment is important.

But there did come a time when I stopped reading much psychology. I stopped trying to censor what I talked about in therapy, and if my life was boring and shallow and stupid, if my immature reactions and thoughts and fantasies were exposed, well then therapy was the place to figure out how to get where I want to be, a place to learn about everything. I also still struggle with my life vs. my therapist's life - her accomplishments, lifestyle, family relationships; what I know is real and what I fantasize about. (I tell her when I'm struggling with talking about something because I am comparing it mentally to her "perfect life". We laugh and go on.)

It could be interesting for you to take a break from the reading for a few months and see what happens..