sex not the same.. have fears

Mystia
So on Feb 18th 2015 I gave birth to my husband and I's last child. During the birth of our 9pound 2 ounce 22in long son, my vaginal opening ripped down and back and I had to get stitches down there.... which wasn't the worst part of the whole thing, the healing was worse than getting the darn stitches. 
Well fast forward.... our son is going to be 2 in roughly 3.5 months and I don't always enjoy sex anymore (more often not enjoying it than enjoying it) . In fact, sometimes when we are getting busy, I am fearful that I will rip again. I can't do it from behind because when he's in, I can feel the intense pressure again where I tore. No pain just pressure and of course my fear of tearing again. We try lube and lots of foreplay but I'm still afraid. 
Do I just need to relax and know he won't tear me? Or is my fear legitimate? 
#dontwanttotear