I bought my tiny handmade sketchbook from this popup stall for the same reason, if I have to draw that small I can't overthink anything XD

I haven't drawn in it for a while and really should but time x_x and also I have learned from experience that while it's very cute and I still love it it's a terrible size for me so the next one I get will be closer to A5 size.

It's fine if some of the daily paintings/studies/whatever you're doing don't work. Now you know what you need to work on or what techniques do and don't work :D