I used to feel like this before I started taking notice of the gradings on the quilt pattern. There's often some sort of rating but I never bothered about that! I was making the quilts I wanted to make - blocks that were way complicated or fiddly or just too involved for where I was physically at. I started reading the patterns carefully before beginning and then I mulled them over for a while and then, before even buying my fabrics, I made sure I understood exactly what I had to do rather than what I thought I had to do. Once all that made sense and I could mentally see it and feel comfortable, then I would attempt the next level up from what was classed as easy. I still go back to easy when it suits and I've found piecing to be much more fun that way. I try not to do two involved quilts back to back still, and I do some paper piecing or applique in between for relaxation. Maybe that's you too, or maybe not, but I know that being aware of my limitations without being negative sure helped me get more enjoyment.