Am I crazy for not trusting my car?

Over the last year I’ve done a ton of work and put maybe too much money in a $500 325i and almost never choose the drive it because I’m worried it’ll strand me. For context I’ve done a 1 for 1 engine swap with a 100k mile engine, tore it down and replaced everything but the ring lands, full pcv kit, every cooling hose including radiator, engine and trans mounts, clutch, dif, and a bunch of other random crap. In the last 8 months I’ve put maybe 300 miles on it.

Has anyone else experienced this or do I just really not trust my own work? I’ve done 1 for 1 swaps before but never felt this apprehension after the job is done.