Is it normal to be really into the moment?

whenever i do something i get really focused and intense like when i play games or do some physical activity. the feeling is like getting into the zone and going all out and trying hard w/ thoughts only on that certain event like winning the game or making the shot. its hard to stand still for long periods of time and when i do i get shakey and its kind of hard to relax. my mind is always on the fritz w/ thoughts especially when im in the hotseat and under pressure. the other day there was this cute girl that said hi to me but i was thinking way too much and hesitated and said 'heyoo' then walked away like an idiot.