Yeah, unfortunately stuff like that happens and it is totally out of your control but again usually they are only minor and they heal really well. Your vagina and vulva will feel like that regardless of whether you tear or not because when you think about it it does a pretty amazing job to stretch to let the baby through. If it is troubling you, run yourself a 'sitz bath' - a bath with a decent amount of salt in it as it is really quite soothing. You could also put a compress on it as well.