Hi there,
I don't think there's anything wrong with using just your fingers to strum. A pick might be useful if you're trying to pick out something very fast and complicated, but if you're simply strumming, or playing a few riffs here and there, your fingers will do just fine.
There are a number of really guitar players that don't use picks at all. I wouldn't worry too much about it!
I don't use picks very often myself!
-Billy
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