I have gone days with only positive energy feeling great. But over a period of time, the negative energies that you see and experience is enough to dampen all the positive energy you can generate. That is because of the amount of interactions one has; there is no way everyone is going to be positive or positive all the time. Thus it is important to avoid the negative energies at all costs. Just remove those negative energies from your life and thoughts even if it for some time. Once you do that, you will start to see yourself gaining traction on the positive side.