It's called builders block Kevin, along with a bunch of other stuff in the real world. I haven't touched a model kit for the last 7 month's and did the same thing you did. I picked it up then put it right back down. Building top quality models take's it's toll on you, the next one has to out do the last one and with my build's that is a real hard act to follow. I only put the pressure on myself. As of 3 week's ago one of my member's asked me if i could clear one of his car's cause his airbrush had gave up on him, after smelling the sweet smell of Urethane Clear i have completed 2 full detail kit's. We had our talk last night Kevin face to face and i hope that inspired you to get back to building. Never be affraid to put it down and walk away for a whyle, and if you think your not doing good, step back and re-think what you wan't to do.
Your friend
Anthony R.