It looks like there may be some receding going on.
Well you did ask...Don't tell me that...
Wait till you're 40!
Yeah....I guess I will fall under the old curmudgeon club by saying that if you go through the effort of posting a picture of your head on an online forum to get the opinion of people that don't know you.....then a) the answer is yes, it is thinning, and b) you are probably to worried about your appearance.