Okay this has kind of been an issue since i became sexually active. Im 19 and started having sex at 17 (quick meaningless insight).

When I have vaginal sex or even have oral done on me, it feels great and all but I never know if i've finished. I'll be in the heat of the moment and don't really notice or pay attention, and then when we finish im never fully satisfied. Is this normal? Am I doing something incorrect? Am I just not paying close enough attention?