For some reason my vagina is dry and the slit right below my clit is swollen on one side, any suggestions as to why and is there any product someone suggest for the dryness and swollen slit?

How tight do you where your pants? What kind of fabric is your underwear made out of and what style are they? These could all contribute to surface irritation while you walk and sit.

Are you drinking enough water each day to keep your skin soft and your urine a clearish colour rather than yellow?

I drink water everyday, as for my urine, it's clear, but with a light tint of yellow to it.

Majority of the time I have cotton, but sometimes the material is Nilon.

I wear the size jeans I'm supposed to wear.

All this occurred after I sex for the first time.

Drink more water, definitely.

I like to moisturize my vulva with a lotion or jojoba oil. It helps a lot.

If you've just started having sex theres a possibility your hormones are a little all over the place and this could be the reason for dryness. Or if your using condoms or a contraceptive it could be a reaction to that - some people are allergic to latex or certain lubricants, and the pill can cause abrupt hormonal changes that cause dryness in that area. I don't think its an std, doesn't sound like one. If you've started having sex you should think about going for a pap smear anyway so see a doctor,

He/she may have cut you, if he/it was big down there and if he/she was doing anything else with his/her hands I suppose his/her nail could have caught you.
Try and get to a doctor just incase.
Sorry about all the His/Her but hhm you never know :)

Sista, maybe you ought to check with your doctor. Could it be an infection of some sort? Ya just never know. Maybe you should try going commando (no panties) see what happens. My Wahine wheres a thong all the time and never has any problems. Aloha, J-man