Sex life is over..

I’m 4 months PP and have tried everything.. I had a 3rd degree tear during birth and ever since then I can’t get into the mindset of having sex. At first I thought I was stitched to tight. Then I thought I was to dry.. But I’m honestly just beginning to think maybe I have PTSD. Because I can’t even shave down there. The thought of anything going near there scared the living daylight out of me and I just want to cry.. I don’t know what to do. My boyfriend is so understanding and supportive. It makes me so upset to know that I’m putting him through this.