I just started working as a cashier... it's only been 2 weeks and I've made all sorts of mistakes including shot... today I got angry with my boss because there was a shot in the till... due to the mistakes I've made in 2 weeks I've started feeling scared and pounding every morning before going to work and started wanting to quit work but I think it would be very detrimental if I quit... can I get some advice and words of encouragement to boost my work spirit.