if you don't keep yourself happy enough to be stable, you will not be useful enough to really help anyone. Also, you getting ice cream or playing a video game on its own does not cause the suffering of hundreds and thousands of people. As a leftist, you should be organizing to destroy the systems that cause that suffering, not attacking yourself for working within that system. I can't call you out on this one too hard, I haven't really done my organizing. Also, if you develop yourself and your skills, you will be able to help more people than just throwing yourself at some project randomly, that's just adventurism.