Feeling weird/really uncomfortable when i reflect on the "self"

The title is probably confusing so let me explain. When i think about myself, i mean things like the fact i exist and that i can comprehend that i exist, i feel really weird. Almost like i am dreaming. Like if you look at your hand for example and just think: this hand belongs to a person and that person is me. If i focus on this longer it starts to feel weird. Haven't done it for longer than a few seconds (less than 10) cuz am scared something weird would happen lol.

So, my question to you guys is, can you even understand what am saying? If yes, has it ever happened to you and what could be causing it?