What about if I have motivation?
I've worked with several teams over the decade, After the first two weeks I find motivation usually dies for my teammates (and this applies to myself as well). While motivation is a complex topic to discuss, at least for trying to self motivate for moths at a time. But for the first two weeks the concept is pretty simple. start a team, talk about cool ideas, and make a plan, 'we want to make an example main menu in two weeks' and then not much really happens. Sure someone can make a mock up, but it is just a basic 'learning how to make a menu' example and it fails meet expectations. Its not that people expect something great with little effort, people know not to expect much, but even knowing this i find teammates still get discouraged when their work fails to capture the same energy as what they were envisioning, and while 2 weeks of work seems like a lot, it doesn't feel like their results reflect this, so it makes them worry how much more it will take to actually get something close to what they want.
I myself couldn't focus on a project for more than 2 months at best, but mostly only for about 3 weeks. I've only recently improved due to pacing myself to work at a slower rate (getting older, mind and body don't work like it did in college, and found a stable job that I enjoy, also having good friends and family helps) and finding a project which I absolutely, can not, stop, I must work on this project for the rest of my life, no other project can trump this project. I only reached this point after having many failed projects, many cool ideas started and stopped, learned many things but finished nohting, but then all my ideas came together into one super project. So feel free to play around, and keep trying, learn a bit about yourself and see what motivates you, how long, and what it takes to allow motivation to come and go as needed.