I don't know where you live but where I live, riding bike is good and public transport also. Besides: how would biking make you more depressed? Wouldn't it rather be a good thing to do some sports?
Understandable. I ride 26 km a day to work and bike lanes in my city suck. You either ride on the most left part of it and risk getting hit by a driving car or you ride on right and risk getting doored. And if you don't keep a meter distance to parked cars it's already part your fault.
Also had my first crash after a few weeks because a motorist didn't see me. And I never had a crash in my almost 10 years and ~175000km of driving cars.