Hi I'm new here and I have a problem...

As you can see in the title, my ejaculate has been yellow recently. It started about two, three weeks ago. I was watching porn and I had pre-ejaculate, but not the real thing. Actually, I've never ejaculated before, and I'm pretty sure never experienced an orgasm, dry or whatnot.

So as I was getting "wet", and I didn't want to soak my underwear, I used tissue paper to clean it up. The next day, I felt searing pain in the tip of my penis. At first I thought it was just a mere papercut, so I let it be. After a few days, it got better so I watched porn again... bad decision.

Same thing happened, but this time I was scared of what I thought was a papercut so I didn't bother cleaning it. Just let it be. Next day, same pain was there, but this time there was also yellowish stuff on my underwear. For the next couple of days, the yellow stuff kept on appearing, then it disappeared. However, the pain remained, but not as great.

A few days ago, I got wet again. Same everything, and today I'm here desperate for help.

So to cut it short, what I'm experiencing is:

Yellowish pre-ejaculate (I think that's what it is... but googled it and nobody's ever heard of yellow pre-ejaculate, on yellow semen.)

Pain at tip of penis.
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Some facts about me:

I'm 13.

I've never masturbated or had an orgasm (I think)

Never ejaculated.
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Here's some pictures of what my underwear and the yellow stains look like:

http://i25.tinypic.com/2pocvb9.jpg
http://i25.tinypic.com/2n08ubc.jpg
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Please help me.