If you can't get a gun, get some self defense training. It can help foster the same mindset and confidence that carrying a firearm would.
A lot of the attacker/victim relationship can be boiled down to very instinctive and primal behavior. Predators naturally seek prey. Don't look like easy prey. That confidence you get from carrying a gun? That's outwardly perceivable to would be attackers. Being alert and aware of your surroundings, making eye contact, and how you carry yourself are all analyzed by the primitive parts of our brain and subconsciously feed to the executive function.
All that being said, stay strapped or get clapped.