So what if I have learned Krav Maga (and Muay Thai, and Brazilian Jiu Jitsu, and dabbled in Sanda/Sanshou and wrestling) - and still feel incapable of defending

So what if I have learned Krav Maga (and Muay Thai, and Brazilian Jiu Jitsu, and dabbled in Sanda/Sanshou and wrestling) - and still feel incapable of defending myself against an armed assailant. Is it okay for me to own a gun now that I've jumped through your arbitrary hoops?