It is becoming harder to retract my penis?

Hello.

I am 15 and have never masturbated before, however after having an experience which I think was a wet dream (I woke up and my bed was covered in clear watery stuff, I don't know though, as semen is supposed to be white and sticky. I'm a virgin though so I don't have gonorrhoea or a STD) I have been finding it harder to retract the penis in a shower or a bath.

Since I was around 10 it has been really easy for me to retract my penis and clean it effortlessly (no smegma problems here), but for about a week now it has been a bit harder to retract. I can still retract it in water, but it takes longer to do so as around halfway down it seems to get tighter. I have no idea what to say or what is going on.

Also, are you supposed to be able to retract the penis out of water like a bath or shower? I am able to do it, even while the penis is erect, but once again it is relatively more tricker and a tiny bit painful (?) I can't really describe the feeling.

I have 3 questions I mostly need asking:

1. Was my experience a wet dream or just plain wetting myself?

2. Why has my penis gotten "tighter" recently and is it normal (I'm not really open to the idea of circumcision, sorry)?

3. How easy is it supposed to be to retract the penis out of water?

Sorry for the hassle and long post.