This is a little icky...
So about 3 days ago I sat down then bent over to grab something and I noticed that my vagina was super sore... today I decided to use a mirror to look at it to see if something was wrong...
There was. Anyway I saw that the skin directly next to the opening of the vagina was incredibly swollen and red... I've never had sex so I know that isn't what could have caused it... I also noticed that there is a lot of random discharge like whenever I pee and change my underwear...
Please help! I'm very worried that something serious may be wrong!

There are several things it could be, and you need to see a doctor or nurse for any of them.
The most common are infections and cysts, such as around an ingrown hair. There are different kinds of infections with very different drugs for treatment.