Hi Pierre,
I have suffered from this too and I think there can be many reasons- here are some that have applied to me in the past.
Are you building a boat which is just too long a project? It took me six years to finish my first boat and I’m amazed I persisted with it. When I was younger I had very lofty ideals about scratchbuilding and consequently achieved little. I am not so ‘snotty’ about kits now and perhaps a simple kit would fit the bill-at least as a kick start. I knew a chap who built very simple models out of junk basically – he said if it took longer than a week he lost interest! You couldn’t find a model boater who was ‘happier in his skin’.
Who are you making models for? Only yourself in the end, surely, and if you don’t enjoy it what’s the point ? It’s easy to fall into the trap of building to some high ideal that you see another or others doing and it’s so easy to beat yourself up over perceived failures.
Sometimes the rest of life can get in the way- carving out a career and bringing up children makes it hard to get motivated, especially after a long day at work.
I have found this forum a tremendous inspiration- post some pictures of your boats and people will most likely be very encouraging and that may give you the boost you need to keep you going.
I find having a realistic idea of what you want to achieve in a session helps- ‘lying in bed thinking time’ is useful here.
Finally, keeping my workspace tidy helps- if you are faced with a tip then it’s easy to turn round and go out again- but a friend of mine says that if it isn’t on the bench then he doesn’t know where it is! So we are all different- whatever works for you -maybe, like me , you are just a slow builder. I’m not saying any of this applies to you, but it has all applied to me over the years!
Sorry if this sound a bit ‘preachy’ – just my thoughts.
Have fun,
Ian