Its not uncommon to be attracted to more than one person at the same time. But whether or not you act on those feelings wont only affect you. If you want to date more than one person, make sure that everyone involved understands this and is okay with it. Also, be sure beforehand that you can handle it.

Is it okay to be talking to multiple girls at once?

It is ok to talk to multiple people at once, as long as you havent indicated to one of the women that you are seeing her exclusively, and as long as you dont expect these women to behave any differently with other men than they do with you.