Hey Rubby (LOVE the name), my very first piece of advice for you is don't be down on yourself!! Turn that frown upside down (amazingly enough I'm in my 20's and still use that phrase), sad isn't it? I am 5ft 3 too by the way. But anyway, I just wanted to tell you that the surest way to fail is to not believe in yourself so make sure you have a positive attitude and believe even though sometimes it is horribly hard. As has been mentioned above walking and swimming are wonderful ideas. You could also consider free weights, low impact cardio machines like an eliptical trainer and also many gyms have classes designed for low impact on joints so you might want to look into that. And last but not least if you ever need someone to talk to about anything, diet, life etc. feel free to ask me.
Take care and Good Luck!
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