How do I cope with depression

I've had a feeling I've been depressed for awhile. I've been sleeping more, but I still feel tired. I can't find the energy to do anything. It gets like this every time I'm alone. Like, during the summer.

How do I cope with this? I'm tired of feeling this way. People will say, "oh get out more", or "try a new hobby." I've tried, but they don't last because I really don't see the point in doing anything for myself. I don't want to bother my folks with getting a therapist either. A small advice would be very appreciated