WHY? 

Simple: game will be made and not put off

1. Stop thinking it will be better if you made a different game: instead, make the game smaller ,even if that means releasing it in a day and will be sold on itch.io for £2
2. Set realistic goals:  I like to keep a table for all my goals and when I'm going to complete them and what I'm going to do when I complete them
3. Maintain a healthy routine: go to these links and start from there CGP Grey More CGP greyBlackthornprod
4. Show your work: Read Austin Kleon's show your work 
5. Write down your worries to get some space from them 
6. Make it fun: Remove the fear and it will be fun again,