I am a night owl and tend to stay up very late every night
Me too! I love being up late at night.
An early bird is the opposite of night owls they go to bed ad get up early
I'm trying to be an early bird but my body can't get used to it.
So you are trying to go to sleep early and get up early, that is tough for a night owl 
Yeah it is. Are there any benefits to being a night owl?
Well in several countries Night Owls are called B people while Early Birds are called A people
Interesting, I've never heard of that.
night owls may stay awake until just before or even after dawn. Night owls tend to feel most energetic just before they go to sleep at night. 
Some night owls have a preference or habit for staying up late, or stay up to work the night shift. Night owls who work the day shift often have difficulties adapting to standard daytime working hours.
Night owls have often been blamed for unpunctuality or attitude problems. Employers, however, have begun to learn to increase productivity by respecting body clocks through flexible working
Night owl (person)
A night owl, evening person or simply owl, is a person who tends to stay up until late at night, or the early hours of the morning. Night owls who are involuntarily unable to fall asleep for several hours after a normal time may have delayed sleep phase syndrome. 
The opposite of a night owl is an early bird – a lark as opposed to an owl – which is someone who tends to begin sleeping at a time that is considered early and also wakes early.