Body Image issues

So when I was 17, I was at my fittest. I was doing Tae Kwon Do three days a week, Jiu Jitsu for 2 days, and dancing for 5. I had abs! I was only 135 lbs. Then when I was 18 I got injured in dance and the ortho surgeon told me to stop everything I was doing for a year. So I did. Except dance because it was a class at school. Now at the age of 21, I'm yo-yoing between 185-195 lbs. I'm trying so hard to get back in shape but I always feel like I can't do it. I was the thinnest in my family for a really long time, but now my mom and sisters always give me shit about my weight and they said I'm cursed to be like them. My self esteem is dropping and I don't know what to do. Any advice?