Postpartum sex

I'm 4 months postpartum and still struggle having sex. I had an episiotomy and stitches during labour and when I went to my postpartum appointment was told I healed well but it's still so painful to have sex and the pain is not inside of me it's where I had my stitches and sort of feels like a bad sting. Has anyone else had this problem or know what it could be or how I could stop it?? :(