Simple lock picking is far from simple. The best lock builder is the one who can pick any lock. You can be interested in becoming a legitimate penetration tester without ever being a thief. It all depends upon your morals. Although from my experience while learning (hacking) you pickup how to build the house along the way. It may not be as nice and pretty as the contractors house but you will defiantly be able to build the basics. The hacking path in my opinion is a never ending education because there will always be more you can learn about it. 10+ years in and the only thing I know is that I know nothing.
I never understood people who killed themselves quietly with noxious gases.
I have nothing against suicide, but it's lazy to not take some of the system that annoys you down with you. For example, if you dislike the UK government soldiers and the Queen (in her capacity as CIC) are legitimate targets. Soldiers are likely to be an easier target, but just remember they all wear body armor now so a stabbing to the neck is probably your best bet. Has the advantage that such close-quarters combat should get you killed too.
If you want CO, just light a coal barbecue inside. It's more dangerous to others due to the fire and the buildup of toxic gases, but the government banned exit bags so who gives a fuck? Exit bags are a meme anyway. Suicide by cop and other kamikaze stuff is actually fun and productive. Slashing one's wrists works perfectly well and barely hurts if done right. Same with trainjumping, jumping and getting shitfaced naked on a cold winter night. Why go through all that extra nonsense just to spare yourself a small degree of pain? If pain scares you that much, just grab some opiates and use literally any means and you won't feel a thing. Feed yourself to piranhas for all you'd care.