I have it too. I also have a problem of getting deep into a project and when I start to get burned out (usually 1/2-3/4 way), I begin thinking of the next project I want to do instead of focusing on finishing the current one.
This!!!
My sticktoitivness sucks!! My last big project was tearing my old sammi apart and putting yota stuff under it and an 8V in it. I got all the parts, tore it down and then lost interest. JunkYardDog showed up one night and said "quit talking about it and get to work" haha he would just come over and sit on a bucket and stare at me if i didn't need a hand, he even made it a couple of date nights just watching me to keep me motivated. Maybe hire a personal motivator to follow you around to remember stuffs.