Is it normal that i piss like this?

It could be that they may not always be peeing into the water. Like, they might hit the bowl and you wont really hear anything. Or worse, they might piss on the seat or floor. I have a steady flow. Maybe get a few squirts at the end. But i personnally try and avoid peeing straight into the water and aim for the bowl, so people cant overhear me peeing...

Normal, and I can do both, depends on the "technique" I use to piss. Sounds funny, but that's what it is.

I think masturbation has something to do with it.

I'm the type of person who starts, then stops, then more, then it stops. Mostly because I have a shy bladder and it awkward for me to go pee in public spaces, but I'd say yours is the normal one.

I like to aim for the middle of the water. Since I was a kid, I always like the sound of peeing into the water. Just like the OP, it's a steady stream that eventually slows down. If I'm in a hurry, I'll shoot out the last few bursts in 5 or 6 shots. Otherwise, I'll slow drip for about 20 - 30 seconds.

sit down to pee

THATS HOW ITS SUPPOSE TO GO

If they're older it's much more likely a sign of prostate enlargement.

There could be one or more of a whole host of problems from a swollen prostate to a stricture in the urethra.

Play it safe. See a urologist and ask for an exam.

I heard somewhere that its a good exercise for the bladder in strengthening the muscles.

I can't believe this question. If you stop to think about it, you'd realize they are practicing kegels while pissing.