Is it normal to not wash your clothes often and dump them on in a morning?

not caring about your appearance is normal.
and the whole clothes thing is hard though, since it sorta depends.
For example, whilst at school my mum had 4 school uniforms/work uniforms to wash on top of her own work clothes, so for school i'd wear a shirt underneath my school shirt, and wear my school shirt 2 days in a row whilst my other shirts were being cleaned, i never smelled at school so it was all good - this is an acceptable period of not washing clothes.
however, i think picking up a shirt you wore for 3 days straight and that's been sat on your floor for a week is nasty.
trousers i guess can go for 5 days at most before they need to be washed, and underwear i won't wear more than once.

How often are you doing this? If you never wash your clothes, that's a problem. If you just wear dirty clothes occasionally, don't worry about it.

Not caring about your appearance much is normal, though.

Not care too much about your appearance? Yes. Not wash your clothes often...no. I bet you smell like a lily of the valley.