Are these symptoms connected and should I be worried?

[tlil23]

Hi,
I'm a 19 year old male.  I've been experiencing some strange symptoms of late - I'm not sure if they're even connected nor whether I should be worried about them.  Firstly, I've always been someone who needs to pee a lot, but recently I've found that the urge to go creeps up on me very quickly and more frequently than in the past - sometimes within less than 30 mins of going to the toilet I'm literally desperate to go again.  When I do, I've noticed that my urine doesn't come out in one stream but in little bursts - it's always been a bit like this but I'm not just sure if I've been paying more attention or it has actually gotten worse of late.  In addition, after ejaculation, I get a burning feeling in my urethra when I pee (sometimes up to an hour after ejaculation) and it is very painful and requires me to sit on the toilet for about 10 minutes trying to squeeze the last drops out.  It then continues to hurt and my bladder doesn't feel completely empty for about 10-15 minutes afterwards.  The last thing I've noticed recently is that my sex drive has been basically 0.  I don't know if it's because of the pain after ejaculation (which I've noticed tends to be much worse at night time than if I do it in the morning) or is just a general lack of interest.  I've never had sex with another person before, so I can definitely rule out STIs.  Do you think these symptoms are connected and should I be worried, or should I just calm down and wait a few more weeks (I've been experiencing the above symptoms with increasing intensity in the past few months) and see if they go away by themselves?
Thanks!