dont be so hard on yourself. if you havent touched leather in a while, you have to relearn what youve forgot.
i havent stopped doing leather projects in 10+ years and i still make mistakes. My last boo-boo i did 2x. i was making a leatherman/mnimag holster for a friends-friend and my first 2 attempts were made backwards. somewhere, someone could use them. my first holster i made was dearskin lined and laced and it turned out for a lefty. good thing one of my good friends is a shooter and a lefty, but i tell you i wasnt to happy about my first holster turning out wrong.
if you have the time/materials, try again or you may want to continue on what youve started, but be patient.