No, it is not normal, and you should see a physician.

it is possible that the dildo was too large or you weren't using enough lubrication. It is also possible that your labia minora or the inner lips of your vagina are large enough to interfere or "get caught" or pulled on by a vibrator or dildo when you are not fully lubricated, since most sex toys are harder and not as pliable or forgiving on delicate human skin; when you masturbate your vagina doesnt begin to produce enough lubrication to fully accomadate a dildo for atleast two minutes after being arroused so next time either lube up first or manually stimulate yourself first for a few minutes before blasting off and always make sure when ur either having sex or masturbating to spread urself wide enough so the lips don't get caught or pulled on; this will keep you from feeling sore after. as for the pain you are experiencing it could be that your inner lips were made sore from the initial use of the dildo without sufficient slipperiness, similar to a soreness from having a really long sex session the skin gets tugged on and pushed in and out rapidly but because sex produces endorphines and adrenaline you don't feel pain or soreness until afterward. take a few aleve or IB prophen the soreness should go away after a day or two.

welcome... i know a thing or two about masturbating... as soon as i turned 13 my mom encouraged it. saying no one ever got pregnant, got their heart broken, or got an STD... from a vibrator. Moms are the best but i don't know if i could ever ask her a question like this one.

You have Elmer Fudds Disease.