Strange Piss Problem

Heey, I am 15 years old and I am a male. When I go for a piss ( this has been happening for about 2 montsh now ) I piss fine until the end when im pissing out the last of the uriene, thats when the problem starts ... Near the end of the piss I piss in sections like I cant controll this but I stop for about a second a piss for a second, stop for a second and piss for a second this happens like 3 or 4 times and when im finished doing that the very of the ureine goes up the tube and stops half way was as if there int much force behind it pushing it out of the end, and when it gets to this point it sort of uncontrollably leaks out randomly I cant feel the piss in my penis, whens thats out and I think its all gone I put my penis back in my pants and then some more leaks out again.

What the hell is going on here, its never happenened to me before and its everytime I take a piss. Does anyone have this problem or had it, and does anyone no what may be the cause or no any information about it.

I would appreiate any replies, thanks guys.