I am short, petite and slim.
I spent a lot of time investigating whether the experiences of your mother were in any way related to your own. I suffered from severe anxiety over giving birth so I was actively looking for evidence to support the idea that it was related as my mother had a bad experience.
I trawled through every conceivable study going. However, everything I read suggests there is no correlation what so ever. It is more related to other issues such as the position of the baby, mobility in childbirth and where you decide to give birth (MLU, CLU or Homebirth).
The issue you have is probably more your anxiety - which could be fed from knowing what happened to you Mum. The best thing you can do for that is to discuss it and talk about ways in which you can help reduce that, which hopefully will have a knock on effect for a more positive experience. Especially if your current anxiety is problematic and overshadowing your pregnancy.
That said even then, there is no magic bullet here, and a huge part of it is down to luck.
Anecdotally, people will tell you differently and the danger is this could make your anxiety worse, but reputable studies have concluded to the contrary. It is definitely NOT a forgone conclusion that if you mother had a bad time you will. So say the experts.