Tired running

Ran on the treadmill, ran in the school race, ran for the train and now running after people.....Huh, I'm so tired.... The firs three at least helped me stay fit, the last one has tired me mentally, so resolution 2009 is to stop running after people and leave them to their devices. Do i sound B.I.T.C.H. Y.....( if yes....then great because that was the intent) 

If you keep running after people they call you needy and if you don't they say 'you don't care!' Now what should one do? I feel the best thing to do is just do what you feel is the right thing and take responsibility for your actions.