It seems that I don't have any issues with recognizing emotions and facial expressions; I also understand proverbs and hidden meanings, or so I think. It's just that people with autism struggle a lot with this—how about you? I haven't specifically studied this, but I find it hard to communicate with others, especially when it comes to articulating my thoughts.As stated in another thread, it's part of the hyper-focus that most of us deal with in whatever ways. You seem to hyperfocus in social situations, and after however long, you get tired and feel burnt out - all of it becomes an example of overstimulation that you may experience, and you have probably wondered for a while as to why you deal with such. It's one of the more common traits we folks all over the spectrum tend to share. If you have any kind of coping mechanism, then you can deal with it better. It could be that you have only specific conversations at all. It could be that you need to be sitting down with food or drink (possibly sitting in the far back / corner of the room - furthest from bright lights or music, even). It could be (like I mostly do) that you can't be in big crowds unless focused and rather working on something - you are there with specific purpose, and you don't feel so uncomfortable because of it. Whatever the case, if you leave these situations and immediately feel better, freer and seriously delight in the time it takes to recharge / regroup / reset before getting back to your regular routines...you may well be on the spectrum.
Per memory: My memory probably rivals an elephant's, haha. I can drive somewhere for the first time, ever, and without any map, I always immediately know how to get right back out of there in exact reverse. I've even done this going somewhere in daylight, but then I left for home after dark - no problems. That's just one example. I could go on and it end up a novel in length perhaps, so I'll just sum it up and say that, I remember tons - I remember things from one year of age - I remember things that I wish I could forget, even. Everything is vivid and not just what I saw...what I heard, even.
The thoughts you are describing - that's what's called "intrusive thoughts." They intrude upon you, no matter what you are doing or thinking about (just out of nowhere). Many people get this area of issue depending on their stress levels at whatever moment in their lives. You do want to be mindful of this not becoming an issue that it starts darkly imposing upon you, though - don't let them spiral you down into anger or depression. If that ever becomes the case, that's when you seek professional medical and/or therapy help. Worry appropriately, of course. Don't dwell on just having random, out of leftfield thoughts that derail your train of thought in conversations or such. I've seen all kinds of folks just ramble on, go on tangents and then stop and ask, "what was I originally talking about? Sorry." It happens.
Often, it takes me a while to grasp the meaning of what was said. For example, I realize later that there was sarcasm in the words or that I should have responded differently. I end up replaying that conversation in my head for a long time, sometimes for almost a week. Because of this, I constantly feel tense, as if I'm waiting for an attack from those around me.