I am 16 and cannot pull my foreskin over half way of my tip, I very uncomfortably forced it back as far as it would go to find yellow stuff on my tip?

Dx: Phimosis. Rx: Standard treatment is Circumcision - maning surgical removal of foreskin.
Phimosis. Phimosis or tight foreskin makes it difficult to pull foreskin completely off the tip of penis (glans). It is important to daily clean tip of penis by gently pulling back the foreskin so the yellow stuff (smegna) does not accumulate.