Std!!

I was with this guy and he sleeps with like every girl it the last time I will ever not use protection i regret it and ever since I feel like my V is feeling different like it’s itchy at times and smells a little, I’m scared to go to the doctor because idk if it will show on my Insurance and all that what should I do??my V has never smelt like this or ever been so itchy after having sex but my friends think I don’t have anything. I don’t wanna tell my mom and I’m underaged