The only thing you have complete control over is yourself, and your own attitude.

Your happiness is your own responsibility. You can CHOOSE to be optimistic, choose to focus on positives, choose to look forwards and build your own positive future. Do not rely on anyone else or compare yourself to anyone else. Internalise your focus: focus on what you CAN do and what you have already done to get yourself to this point today.

Make a list, write it down, it’s more difficult to argue with yourself if the facts are written down in black and white.