Itchy vagina... After masturbation?

I want to get one thing straight: I'm still a virgin.

I do masturbate but EVERYDAY. When I start masturbating one day, I may feel compelled to do more for the next few days before I completely forget about the topic. It's like how PMS works!

When I feel frisky, I don't always masturbate but ill get wet and it leaks onto my underwear depending on how frisky I feel. But then I don't change my underwear until my next shower which could be right after or a few hours later...

I am a swimmer so I will maintain the bikini line as best as I can and I think that when I shave farther down it might contribute to the flaming but honestly I don't know. The last time I shaved down there was a few weeks ago.

I honestly have no idea what's going on. It's just really itchy on the outside!