I have just discovered my vaginia is swollan, its quite sore to touch but not very very painfull I've never had this before and I'm very worried and upset about it.

Your vagina is the part of your body inside of you. Are you referring to that or your vulva, the parts of you outside your body? Have you had sex? Are you experiencing any other symptoms?

I'm assuming you mean your vulva?

What part is swollen - the inner or outer lips?

There are many reasons it could be swollen and sore to the touch - but you'll need to provide some more details, as justcurious55, has indicated.