If you find that a 12 gauge kicks too much, don't be afraid to go to a 20 gauge, it gets the job done as well and you can use slugs as well as shells with it too. Don't forget, if you feel like you are over-reaching, try a youth model.
My wife has a Remy 870 20 ga and I have one too. My was the first gun I bought when I was 14. Its in mint condition. We shoot them the most at the clay range. I can shoot it as well as any 12 ga. Nice not to have the heavy recoil at the end of the session. Its definitely an over looked. They were much more popular years ago.