Need help selecting a weapon to protect self against home invasions.

Although I want world peace, and would never want to harm another living thing…and believe in the whole zen/if it’s my time, then I’ll lie down and let the tiger eat me…sort of belief.
buuuuuuut I have just a few more things to do before leaving this place, so I rather “defend” myself for now. (not that I care for a piece of paper/chedder)

Anyways, here is the question:

I think guns (although very reliable) are very dangerous (even if you know what you are doing and respect it) because it is much easier to “accidentally” shoot someone, vs. “accidentally” chop someone’s head off.

I was thinking of getting a samurai sword to keep in my room.

Any suggestions? (diff weapon, where to buy from, tips, tricks etc)
I was thinking about this the other day and the ONLY thing I have in my room that I can use Is my external hard drive (which is obviously not a weapon, trying to be funi /sarcastic I will stop talking now)