Awwww....it's a whole new world for your Littlie - and it WILL take time
It all gets so much easier once you can take them out and about!
With all the dogs I've had, before their shots were all done, I'd
carry them out for quite a long walk every day. In that way, they can (safely!) get used to the sights, smells and sounds of everyday life....so much easier with a Yorkie than with a Boxer or Labrador!!
It might be also quite scarey for your Littlie, with loads of new people wanting to pet and cuddle him. It might be worth introducing new friends one at a time - and get them to get down to HIS level - preferably with a tiny treat in an outstretched hand (so that they can have a little tickly rub under his chin).
Good luck - it will work out ok in the end!
Sally + Harry
x