It sounds like a narrowing of attention perhaps? Tuning out a bit from the surroundings, either by spacing out or hyperactivity?

If it's causing distress or affecting everyday functioning then it's important to get an opinion on it. It could be a bit of extra dissociation - a bit of discontinuity in awareness and time. Seeing a professional would put your mind at ease if it is nothing, but if it's making you unhappy then it is something. Sometimes they can suggest small changes which would improve things for you rather than putting a specific diagnosis on it.