dont' base your decision on the first gun you pick up - that might feel right, but your experience doesnt give you much to compare it to.
Follow Gatoragn's advice. Seek out a range to rent a gun, or some friends who already own them, offer to buy some ammo if your friend will let you test out his firearms (don't make the mistake of insinuating ammo is cheap...it'll lose you shooting buddies real quick)
You'll do yourself many many favors if you take a few extra steps now to ensure you'll get a gun you're going to be happy with later.
Don't do what my wife did, buy the first guy she set her eyes on because she liked the looks.
Then, after she met me, fired some of my guns, wanted to trade it away immediately and get something better.