You come onto a forum asking for advice on how to train a desired behavior. You're getting the best advice. Just because its a GSD forum doesnt mean we dont care about other breeds and want the best possible outcome for their training. Several members here have mixed breeds, including myself. There are certain things you need the guidance of a qualified trainer to teach. What you're asking is one of them for safety sake.
If you're walking with your dog, leash in one hand, pepper spray in the other. My last GSD was naturally protective. If you approached me and I was not comfortable, she would block you, growl and/or bark. My current female is just like your dog. Wagging tail and friendly. I use the fact she's got obedience in my favor because an obedient large breed dog.... well, most people are a little more cautious to approach because they just dont ever know exactly what that dog is trained for.
Find a trainer who knows what they're doing and see if you can work out a payment plan if you're tight on funds.
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