which martial arts are good for self defense?

Hello,

i dont like fear stopping me from enjoying life, having to avoid bad areas at bad hours etc. just cos of the danger
so i need to be able to defend myself physically. our gym teaches judo, jiu jitsu and karate. or should i look outside my gym?


I didn't find the right solution from the internet.

References:

forum.bodybuilding.com/showthread.php?t=123928241

Whiteboard Explainer Video