Is it normal to always be turned on?

For the last few months, I'm turned on almost all of the time. I'm 21-years-old, yet I feel like a hormonal teenager. I didn't have this problem in high school or middle school, which is when most people experience this. I'm still a virgin (don't know if that plays a part or not).

Any time I see a really attractive guy, my hormones go into overdrive. I can't even watch a movie or television show without fantasizing about one of the male characters. I've just gotten to the point in my life where I can actually see myself with another person (before, I would visualize them, but not me with them...if that makes any sense).

This is gonna sound really odd, but the first guy I fantasized about was Jensen Ackles and, now, that type of build and facial structure is my biggest turn on, completely opposite of what I used to be attracted to (Asians and those with similar builds).

So, I have to know, is this normal?