I struggle with this all the time. The only thing that I have found to mitigate it is contemplating the public embarrassment of the resulting failure or lack of completion. This mental anxiety usually gets me moving. Not the best solution, but for now it's about all I have.
You may want to check out a guy named Robin Sharma. You can find a bunch of his videos on YouTube. No need to pay for anything. The videos contain pretty much all you need. I'm trying to work on incorporating his ideas into my routines. What he talks about really is all about mentality and what sets apart superachievers from everyone else.
EDIT - just realized your question was specifically aimed at personal projects. The second paragraph still applies, in that case, but you can ignore the first as there won't be any embarrassment from personal projects not being completed. Oh, that just reminded me...for the personal stuff you can use one of those sites that is designed to hold you accountable by bringing in family/friends to monitor your progress and you set a clear goal with a clear penalty if you fail to deliver, and they are there to see if you follow through or not. The website I am familiar with is https://www.stickk.com/ but I'm sure there are others.
You may want to check out a guy named Robin Sharma. You can find a bunch of his videos on YouTube. No need to pay for anything. The videos contain pretty much all you need. I'm trying to work on incorporating his ideas into my routines. What he talks about really is all about mentality and what sets apart superachievers from everyone else.
EDIT - just realized your question was specifically aimed at personal projects. The second paragraph still applies, in that case, but you can ignore the first as there won't be any embarrassment from personal projects not being completed. Oh, that just reminded me...for the personal stuff you can use one of those sites that is designed to hold you accountable by bringing in family/friends to monitor your progress and you set a clear goal with a clear penalty if you fail to deliver, and they are there to see if you follow through or not. The website I am familiar with is https://www.stickk.com/ but I'm sure there are others.