I'm very much the same way, I'm so dissociative and disconnected from everyone that it's possible I might be a schizoid (although I won't say for sure, self-diagnosing is for faggots). I just take whatever route is the easiest, I never seek conflict and I usually avoid hard work, and I have no friends (only acquaintances).
Supposing some cute girl were to take notice of me and shrink me down to be her pet, I can't say I'd really be all that phased by it honestly. I'd just kind of go along with it, if there were other shrunken people involved I might make a token escape attempt here to convince them that I hate my situation so I don't stand out but in reality I'd be just fine with it.
Really, my biggest problem is that I would likely be just as cold and indifferent towards the giantess as I am towards every other person in my life. If she thinks I'm going to open up to her about my feelings, thoughts, and fantasies just because she owns me and is appealing to my fetish then she can go fuck herself, my mind is mine alone and no one else gets to peek in at it.