Stupid mistakes!!!

Very Very expensive lesson and I wont forget...Making the story short,today when i reversing my car,I only look at my side mirror and I din notice there is a tree on my blindspot and i accidently bang the tree...I actually should take a look at my back or my middle mirror but I din do that,T___T....I reverse quite fast and luckily the tree din fall,and if it fall on my car, maybe now I lying in hospital...lolz...3 hours lectures from parents,I think their confident towards me drop again...Very stupid right??go bang a tree@@Aikxxx..anyone know any cheap workshop???