Try a fairly soft nylon pick. Some have ridges or an embossed logo on them that give your fingertips a little 'grip' so the pick won't slide around. I don't know the brand, but I have some that are a light or medium grey color. they are very flexible. Also try a dab of spit on your fingers to make them tacky.
Second, try strumming soft and slow. Lots of beginners seem to strum too hard. It is not good for the finish of your guitar, but a buddy had a steel pick when I was starting. it forced me to go real easy on the strumming and sounded cool too. Just be careful not to tear up your lacquer.
Try to keep your pinky and ring finger in (like a fist). I started playing with them extended as a sort of cheat to keep control of my hand by letting them touch the body of the guitar below the sound hole. I've gone to more of a loose fist and it allows me to rotate my wrist easier and better angle the pick.
The guy who said to feel the music was right on, too. Pick your best 2-3 chords and make your own thing up. Take a D,A,E or Bm,A,E and play with that. Another thought - I remember feeling pretty good strumming along with Jane Says by Jane's Addiction when I started out. I think its a
G,G-G-G AAAA G,G-G-G AAAA G,G-G-G AAAA D for the intro part, but you can sort of mess with it by itself to get a feel for hitting that low G string.
Just some thoughts - good luck