Are you fragile or were the boys just being overly forceful because you are a girl?

You sound like you are out for wrestling for the right reasons and not to just make a point, but regardless of gender, wrestlers who are oft-injured usually receive the ire of their team mates. The fact you quit the team (regardless of circumstance) won't make your return to the team any easier.

If you are serious about the sport, I suggest you find a weight room and do some serious lifting both before and during the season. This will help you physically and certainly earn the respect you probably deserve. Don't be some side-show that keeps getting hurt. Don't waste energy crying after a loss. Talk with your coach about where can improve and then work on those things in your next match.

I cried when my mom passed away about four years ago. Be grateful that you not only have a mom, but a mom who is genuinely concerned about your physical and emotional well-being. Make sure you honestly communicate with her about your intentions and what steps you will take to ensure your safety and then follow through. Good Luck!