There have been lots of great responses on this thread, but this one is the most comprehensive and “Reality based.”
I LOVE Jiu-Jitsu (GJJ, BJJ, Small Circle, Yoshitsune, etc…) and feel that it’s a great skill set (especially for a smaller person who may not have the mass or ability to generate enough kinetic force to be able to incapacitate a large fully committed attacker). But, you need to beware of developing a “sporting” mindset and/or engaging in unnecessary ground fighting (and by that I am not suggesting that ground fighting isn’t a necessary skill but instead that if you wind up there it should be for good reason and you should have the goal of finishing things as quickly as possible or getting back up and disengaging).
Batman’s point about most assaults on women occurring at the hands of intimate or at least known attackers (and not some random stranger hiding in the bushes) is also an extremely important and unfortunate truth that you should consider. Skills like boundary setting, verbal and postural assertiveness skills, learning to recognize potential issues related to unhealthy patterns of behaviors, and most of all remembering that you have the right to both tell others how they can and cannot treat or touch you and cultivating the fighting spirit to defend those “boundaries” are equally if not even possibly more important than developing a kick ass Straight Right or Rear Naked Choke. As the old saying goes, “an ounce of prevention is worth a pound of cure.”
More and more Gracie Jiu-Jitsu, Krav Maga, and other Self Defense oriented Martial Arts are starting to catch on about these truths and teach more “pre-Active” skills. But sadly, these cerebral, emotional, psychological, verbal, and postural are still neglected or at least under focused on in many Martial Arts and pretty much completely non existent in sport based systems (like Boxing, Muay Thai, Wrestling, or Judo despite those all being excellent unarmed combative Arts).
At the very least I would suggest reading or purchasing instructional/educational materials on the non physical side of Combat by people like Tony Blauer, Melissa Soalt (Dr Ruthless), Gavin DeBecker, etc…and using those materials to not only round out your understanding/skills regarding combat, but to also use as a filter through which to judge/evaluate the physical skills you are learning. Most of us have limited time to train and even those of us who have practically unlimited time are not going to have enough time to develop every skill out there to a high degree. So, understanding which skills you are going to dedicate your time and energy into developing (and why) is important to getting the most out of your training as well.
Good luck and hope this helps.