Ok, so check to see if it is an infection but if its not, it might just be the way you are, alot of girls have this "problem" but its sometimes normal, dont be shy of it, people who care about you, wont care that your vagina is "saggy" because its you. If you dont have an infection, dont worry about it. If a guy loves you enough to have sex with you, it shouldnt matter.
You should see a doctor to be sure of what it is. This way the medication will work properly, too. Yeast, bacterial, etc. Hope this helps.
How do I get treatment for a yeast infection and what is a yeast infection or could it be something else
Is it possible you may have a yeast infection causing it to be swollen?