19 years old, still a child, but legally an adult. It is impossible to protect your family and relatives in this way. It can only bring them crisis and worry. What you have is enough to protect yourself and your loved ones in today's society. Our rights and interests must be protected by law, and fighting violence with violence can only cause trouble. You can learn, but I suggest you change your mind.

Don't ask what technology is good, what technology can defeat three with one enemy. It depends entirely on the conditions of the individual and the other party, and there are still many uncertainties.

/kloc-learned taekwondo at the age of 0/6 and studied under a Korean teacher. Practice Sanda at the age of 20. Now learn form and meaning. I have come into contact with many skilled military police, fighting teachers and martial arts coaches, although their technical characteristics and working environment are different. But they all say two words: Germany and France.

I hope my answer will satisfy you.