When I was 18; I got an Z4,2.0 for my birthday and I got alot of jealous comment, can't imagine what your life should look like from now on
Im 21 noww and I got my M for 4 months now... You just need to learn to drive it. Go on a abandoned road with your dad ( not friends for god sake) and try to get to know the power. It is no normal car!
Be safe, dont overdo the speed limits and do not accelerate to much in corners.
Congratz, and bless parents who buy those cars for their kids ( like mine)