When I masturbate it feels like something is coming out of my penis and I stop at that moment

Hello, i'm 13 and a few months and i stll haven't got any sperm, i know it's normal but heres my question. So this could sound weird but i have to ask someone, i masturbate sometimes, when i'm doing it for a few minutes like i feel something coming through my penis i think, but when i feel it i immediatly stop and it actually feels like something has to come out but can but it's hard idk how to explain this, sometimes a little splat comes out but idk what it is.. should i try to make that thing come out i feel or is it just my brain thinking something, i'm sorry if it sounded weird but i just had to ask someone. Thanks