So, I want to do some martial arts, for self defense. Ideally one that will be useful without giving me CTE, or any long term bad stuff, even though I feel this is already asking for too much 
I don't live in the U๐๐ so gun related stuff isn't really an option.
I'm somewhat heavy, with a year of experience in lifting, and my cardio is not the best, but I can do long walks (of 1 or 2 hours) before getting tired.
I'm going to move to a bigger city in September, and there's a lot of stuff available, so you can comment on the more niche options.
So yeah, any advice from your experiences is welcome lol
If I had known people started arguing over my post I wouldn't have made it.
Judo and Brazilian Jiujitsu are very effective and dont involve any head hitting so no cte. They focus on how to react if someone grabs you which is good, because in any other case you should be running away as fast as possible.
the problem with only training no-strike arts is that in the real world somebody is going to hit you or try to hit you, and you need to be ready for that even if training in it isn't your main thing.
and you can only wrestle one person at a time, and a lot of street-violence is groups
My thought process was training specifically in being grabbed for maximum time value, since in every other scenario you should be running for your life or using a weapon and the training will boost your stamina for running anyway.