Im almost 14 and can't cum (help, this one is different) male

So, i have masturbated FOR A YEAR, but no sperm comes out. I usually masturbate in my bed while looking at my phone so i can't see my penis. However recently (about a week ago) my skin on my penis finally took down, so i began masturbating and it was 3x more pleasure. Then in the end instead of usual good feeling i felt my fingertips got wet. It was some kind of water, it wasn't white, and it was very very small amount. But i can't do that again no mater how much i try. My penis gets erect often and i cant help but masturbate because of good feeling. Usually when i masturbate im so turned on and it feels like i reached peak and about to ejaculate, but no, the feeling fades off and i get tired as f**k and if i still masturbate, after ~5 minutes it happens again. when this happens it wont tickle when i touch head of my penis.

I think i reached puberty i have armpit, public hair, but no voice changes. When i was born my left testicle failed to reach down but my mom said ill be ok with that. She said i could still have kids etc. Could this be the case. I readed stuff in internet, that 1 testicle makes more cum than one. Anyways, im owerveight too. please help someone