You may not be breaking your goals down into the smallest components that you can actually work on - you're looking at the high level outcome and you can't eat the whale all at once. In order to, say, write a novel or create an iOS game, you need to decompose those into specific actions such as learning to type, and then practicing typing daily until you're really good at it; studying Swift, Xcode etc. before stepping into SpriteKit or whatever else follows. Some things can be worked or learned in parallel, just like you have multiple classes in college, but some things need to be done or learned before other things (pre-requisites). Map out your learning and doing that way. I found college very productive, so I now build my own 'majors' and create a curriculum with 'classes' and a syllabus for each, and run my learning as if I were in college, including having a schedule for the 'classes'. Experiment and find what works for you, but you've got to find and learn the core, lowest level actions you need to perform and learn to achieve the higher level goal. Iterate, practice and build up so each day is slightly better than the yesterday. Go watch Jordan Peterson's Youtube video discussing that at https://www.youtube.com/watch?v=M5S6cTQRoU4

Good luck.