<human>: Can you give me the gist of the text in a nutshell?

Possible unnecessary prelims: We've been dating for just over 7 months now. We met at and are both currently in college; both with respectably difficult majors, a science and engineer respectively.

As the relationship has progressed, I've found myself less and less comfortable speaking about anything of intellectual weight with him. He's incredibly charismatic and well-versed in a huge range of topics, with at least one or two knowledgeable thoughts on seemingly anything. He's sharp, and also critical, but never towards me.

It's kind of killing my confidence, since I always have considered myself at least reasonably intelligent. I'm not sure how much it's a factor, but I've had rather major depression for a majority of my life at this point, which seems to just blur out a lot of my memory. I feel like whenever I'm talking or thinking, I'm pulling from one, maybe two years worth of intelligent thought, where as he has seemingly endless reservoirs to draw from. 

I know he sincerely loves me, and he says he knows I'm "bright", but I feel like I can never let my guard down around him and speak honestly about what I'm thinking about. The only time I'm comfortable is when I'm not expected to talk, like when we're doing homework/studying together, or he's asleep.

It's frustrating to me, and to him as well, that I don't really respond to anything that's not to do with my more immediate life. I don't want to be like that. How do I fix it and become more comfortable talking with him?
<bot>: My SO is really fucking smart and talks about really lofty, intelligent topics constantly. I don't feel capable of even trying to ask questions without looking like a moron. What do???