I promoted/graduated 8th grade two years ago. (I'm a Sophomore in High School now. :l)
And, I really enjoyed it.
It wad the best year of Middle School.
You have nothing to worry about.
You won't be made fun of as much for being a 7th or 6th grader.
You go on an 8th grade trip.
You have an 8th grade dance. (At least we did. o wo'')
My point is; it's gonna be so much fun. ♥