Hey mate,
You sound like you're in a similar postion to myself. I've only been playing for about 10 months. But i found that strum pattern came very naturally and i could sing along to it without forgeting what my fingers were doing..... Anyways i found the following songs worked well for me:
Time of your Life by Green Day, Leaving on a jet plane, Throw your arms around me by hunters & collectors, Stand by me by John Lennon, Have a nice day by Stereophonics, and my personal fave is Letter to my Penis by Rodney Carrington.