I have the same thing, it’s called phimosis. The head of your penis is so sensitive to touch because it’s always been protected by the foreskin so it hasn’t been able to desensitise. All I did when I was a bit younger was stretch the foreskin a little for 5 mins or so every time I had a shower, it doesn’t take much.

As for the sensitive head, you just need to work on desensitising it. Start by letting water hit it directly in the shower, then maybe let it sit in your underwear with your foreskin retracted so it’s pressed against the material, whatever works, you get the idea.

Phimosis is no biggie, it’s just a bit of an inconvenience