Welcome to the board, sir.
You have what looks to me to be the early stage of a receding hairline. It happened and will continue to happen to a lot of us at your age. I don't see anything unusual about how you look.
My opinion is that you should do what makes you feel good. If you are not ready to shave (and the fact you are asking us indicates to me that you are not certain) I would suggest you take your time and enjoy what you have while you have it and until you really want to try something else.
Cutting it a bit shorter will de-emphasize the receding hairline a bit.
IMHO you still have enough hair left that you do not "have" to shave. But, you ought to test fly a sly dome if you want to. It is easy to grow it back if you don't like it.
Until you do actually shave, I recommend that you change your hairstyle to de-emphasize the the thinning/receding hairline. Try a high, tight fade on the sides and take the top quite a bit shorter as well. This will emphasize the hair that is on the top of your head.
I think you have excellent coverage for now...but if you want to experiment with going shorter or sly, I think it's worth a shot.