I agree Rob_S and Trooper 224.
Ditch the girl. Go get some relationship coaching to not be so submissive....this isn't machismo internet chest thumping, it's about knowing yourself, how to draw boundaries, and how to select a person to pursue a relationship with. At your age, it's a huge red flag that you even have to ask this question. It's a huge red flag to me that she won't let you bring a gun in the house, I'm assuming even if that means installing a safe and locking it up.
Next, get some training and learn how to properly carry a gun. Condition 3 ain't it.
ETA: might I also suggest to the mods that this isn't an appropriate topic for the "Mindset and Tactics" subforum.