What martial art form would be best to learn?

I am 24.I have always been injury prone ever since i was in school basketball team and college cricket team so i am a bit skeptical about what to begin learning.I will start working soon so it would be a challenge juggling both but i am up for it.Reason i want to learn is the rising crime/rape/road rage in my city which makes me feel vulnerable if i am faced with a situation and i am with my mum or my girlfriend.Also its because two of my cousins are already into Aikido and Krav Maga.
Thanks for your time.