I don't think you ever know in yourself whether you have gone mad. You exist in a bubble. There comes a point where you suddenly feel not really a part of the world, you're just passing through. ↗
The secret is not to give up hope. It's very hard not to because if you're really doing something worthwhile I think you will be pushed to the brink of hopelessness before you come through the other side. ↗
A lot of people like to do certain things, but they're not that good at it. Keep going through the things that you like to do, until you find something that you actually seem to be extremely good at. It can be anything. ↗