That might be true, but it may also be that you just haven't found the cause. It's not always obvious what is causing the depression. In my own case, certain t

That might be true, but it may also be that you just haven't found the cause. It's not always obvious what is causing the depression. In my own case, certain things in my life were just not right (which I didn't realise at the time), and I didn't realise at the time how much they were affecting me. However once I changed those things, the depression cleared up completely. YMMV.