You've done FANTASTIC so far! Wow!
I think 190 lbs is a good goal if that's what you want. There's no reason whatsoever you can't make that.
I agree with Eliana - a lot of the concern might just be for your health. Especially if people haven't been really overweight, they won't understand such a big weight loss.
I'd just tell them you're shooting for a normal weight for your height and frame. If they push for a number, you can tell them 190, and then maybe explain that it's medically a healthy number for you, so that's your goal. Some people will object no matter what.
But yeah, that's why I don't share my goal weight or how much more I want to lose. I say, "Oh, just a couple more pounds." Ahem, like 26. Lol!
Good luck with everything. Maybe find a friend or someone who can understand better and can support you through this? Plus, there's always all of us on this site - we're all behind you.
