To the OP - YES I totally understand what you are talking about! I think it's a very typical way for an INFJ to feel.
I definitely over-think and analyze things way more than other people, which always ends up putting me on a different page from others. I also think about things abstractly and people are always like "do you have an specific example...?" and I'm like "...uh....asjdfls..s.."
I've been in situations SO often where there's a big topic being discussed, and I have all these ideas floating around in my head, trying to formulate themselves, but I have literally no idea how to actually contribute to the conversation. When I try to listen and play off what other people are saying, no one understands what I'm saying.
I think it all comes down to, again, N being so rare and S being so common. I've also been in so many situations where I was trying to explain something that I thought was complicated and brilliant, and nobody was understanding, and then somebody (most likely an S person) came along and said something incredibly simple and obvious, and everyone was like "oh yeah brilliant, that's exactly right!" and I'm like ".... I could have told you that... I just thought it was obvious..."
Also, when asked to describe what I'm feeling or thinking, (probably an INFJ's worst nightmare) I literally have no idea what to say. Whereas an S person would just throw out some concrete, obvious things that they were thinking or feeling, described in concrete, common language. For me...... what I'm thinking right now? That could fill many tomes and most likely, no one would understand... where could I possibly start?
I think being a rare personality type at times makes you seem more intelligent and at times, less intelligent. At times you start thinking something that nobody else is thinking, and you throw it out there, and (if you're articulate) everyone's like "oh my god so brilliant I never thought of that!" But at other times, thinking differently from others means that you're not on the same page, and if a teacher in a class (for example, since we've all been there) says something where he/she expects you to fill in a blank, (you know that kind of question? I hate them) you're like "uh... no idea what you're thinking... sorry.." while all the other students understand right away what the teacher is asking for.