How come whenever I try to do somthing I always mess it up but, thats not the point, Im actually pretty smart and deal with stuff easy're than overs my own age but I almost always mess up everything! For example I opened my bathroom cupboard and went to grab my toothbrush, then suddenly all the other toothbrushes slid out and into the toilet (sorry I did'nt wash it after if you lot are reading this) and also I opened my front door and accidentally smacked my face with my own door! So then is this normal to be Smart and Clumsy?

you aren't stupid. you are clumsy
and yes its normal to be smart and clumsy at the same time
clumsiness has nothing to do with how smart you are