Tear , cut or what?

Ok so I'll try to explain this the best way I can. Lol

I had my baby 11 months ago, I got some stitches because they had to cut me a little to get baby out. So anyways I'm pregnant with my 2nd and I never really thought this was problem but my vagina is always hurting after sex or even after I'm cleaning it with tissue . Like if i do it hard with a tissue on that side it hurts. It doesn't hurt in the front side , it hurts towards the back side where it's about to end , near the butt hole I guess .

And it feels like it will rip apart anytime .

Now is this because I never let my stitches heal fully or what.

Sorry I tried to explain it the best I can lol