Burning When I Pee Occasionally - Prostate Problem ?

I am an 18 year old student, who for the last maybe 2 years maximum has experienced occasional burning when I first start peeing. Keep in mind, this started before I was ever sexually active, and I have experienced nothing else irregular EVER. I mean my urine is normal coloured, it doesn't smell, I always check and there has never ever been any blood or murky looking colours, and there are no other physical marks on or around my penis. But even still, maybe 1 in every 5 times I go pee (which is also not too frequent either, I go pee maybe 4 times a day on average) the first seconds that I start it will burn slightly. It's totally bearable one of the main reasons I have avoided it so long. But I am just mystified why this is happening and what I should do. Does it seems serious and could it be prostate related ? That's my only guess, I am a very healthy guy who does a lot of physical activities, works out and eats healthy. I have no other healthy concerns what so ever except this.