Another common question this one - do you play the ukulele with a plectrum or pick.
Well, personally speaking I dont - I really dont see the need, and find that if I do play with a pick, the sound can be a bit overpowering and sharp.
Tradition suggests that the uke should be strummed with the fingers - held cuddled against the body in a variety of fingerstyles, but generally using the first finger, with some thumb for accenting or other fingers in a fan style.
If you have short nails you will get a softer sound, but growing the first finger nail will add to your "attack".
All of that said, a trawl of Youtube will show you that plenty of people do play with a pick, so it isnt "wrong" - whatever you choose.