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I just got a catfish at my LFS and I dont know what kind it is silver with black stripes on its sides it has very long white wiskers and is very active, also right before its fin it has a black bar.

erm can you a bit more specific?
Like which fins...size...body form...

it has a big fin and the fin slopes into its head, it has a tail like a shark. it has six wiskers, 2 of which are longer then its body, it is very very active

I think youâ??ll find that most fish are impossible to id without a good picture.
But perhaps you are describing this fish?
Pimelodus ornatus

post a pic when you get one.

turns out it is a pimelodus blochii. Is this fish hard to take care of?

Iâ??ve never had one, but I have several Primlodus pictus and they are not bad to care for.
Not picky eaters either. If they can catch it and get it in their mouth, it's fair game to them. They love bloodworms too, get the frozen cubes and they will tear them apart.
Also, mine like to hide every so often so make sure they have a nook some where to go to when they donâ??t feel like being seen.

I'm keeping a pair of P. blochii at the moment. Just as active as P. pictus, but not as sociable. Even so, they are not overtly aggressive to one another (just that they ignore each other).
They are fairly easy fish to take care of. Not too fussy about water and food either.