You don't have to be a skinny winnie to ride. Im fluffy as are many members of this forum. There are others that will try to discourage you from riding and put low weight limits on riding but just take it with a grain of salt. As long as you listen to your horse and watch for signs of discomfort you'll be fine. Make sure you control yourself and arent just a rag doll up there in the saddle (which is something EVERY person regardless of weight has to do) and make sure you have fun.
Post pics of you two riding!!
Oh and no I wouldnt say the same thing to someone who is 400lbs. There IS a stopping point with weight and 220lb isnt it :)