Tijuana is not a good city to visit, but actually Mexico has some of the most beautiful places in the world such as Cancun for many people is the most beautiful beach in the world, Mexico is rich in culture, food, friendly people and awesome places.
Mexico has many poor people it is true but if you are afraid of mexican poverty you are not ready for the world, because mexico is the best economy in Latin America, and it is nothing compare with african poverty, also in USA and Canada there are poverty although is less.
so just enjoy mexican culture and do not spend your words traying to talk only about bad things.