I would go with a short buzz, and then shave. Nothing wrong with your head shape.
Every guy that thinks about shaving also things they have an odd head shape. Like others have said, try a short buzz first and shave when you are ready. Keep the beard, facial hair helps take focus away from your scalp.
Welcome to the group, Carlos!Yes, I see some slight thinning, but I don't think that you're at the point yet that you absolutely have to razor shave (unless you WANT to). Since it is starting to warm up, now is the time to perhaps try a 1 guard first, but your hair already looks fairly buzzed in your photos. Check out some of the stories in the Introductions and To be or not to be bald sections of the forum and you'll see similar stories from other members. Good luck and feel free to ask questions, even if it is 4am
Go for it. You don't "have" to shave now but the goal should always be to start shaving before it really becomes a necessity. If you're starting to consider it, then it's time to do it.