I can feel the weak aura of the people and their negative energy. I am very uncomforable and sometimes cry.
I am emphatic too, I mean I easily pick up the surrounding energies and moods of the people around me, also places. It may be annoying.
But I don't reach the point of crying so it seems you have a more serious problem here.
Yes average people are at a very low level; much depends also on where you live.
So, apart of doing the closing the chakras meditation that you probably already know, how you feel about people can modify your level of empathy. If I go to a country where I strongly dislike the people lifestyle, I pick up less of their moods, on the contrary where I feel much at ease, I pick up more. I think HPs Lydia once said it's much related to your mind, so you need to be firm with your mind and command/affirm that you don't pick up others' energies or so. Ok... I know the solution but I am not the best to apply it as it's not easy. When I am not focused, the mind starts intermingling again - I think this needs time and many affirmations to reprogram yourself, but among the many things I need to fix, I put it in the waiting list.
But why cry? Do you feel their sadness or is that your pity for them? Or pity for yourself for being among them all the time?