Some debut YA books from first time authors with word counts over 100k (this is just off the top of my head):
148k Beautiful Creatures
130k City of Bones (first Mortal Instruments)
118k Twilight
117k Before I Fall
There are more I know but I can't think of them right now. So if your ms is as tight and polished as you can get it, then don't worry too much about it (although, I agree you'll want your query letter as short and snappy as possible to show the length isn't b/c you're too wordy). That said, you do want to make sure your ms is definitely as tight and polished as you can get it.
When I actually look at these books, only one really deserved the word count. The others could've been edited thoroughly. And Lauren Oliver, I do believe, didn't have an agent. She works for some kind of book packager and I
think she sold directly to an editor. Most of the complaints for Beautiful Creatures is that it's too long, too boring, and too repetitive. I'd agree. I haven't even picked up the sequels because they're even longer. You can say the same about Twilight, though, I don't know the length of the sequels, but I will say the series got better with subsequent volumes. As I've never finished Mortal Instruments (and have no desire to do so) I won't comment. My sister read City of Ashes and City of Fallen Angels and I remember her groaning about the length.
If you look at Harry Potter, the first book was actually pretty short. They got longer as the series progressed. I'd advise cutting 11k off and seeing if you could get even slimmer than that because when I look at word counts for debuts that go over 90k, I wonder how much of the book is repetitive filler. I trust authors I'm familiar with to get lengthy (well, I don't trust Stephen King).
Just ask yourself if it's worth having that six digit word count or getting a few more *potential* agent bites. Sure, your perfect agent might accept six digits, but I wouldn't want to alienate any of my prospects. I want nothing that I can prevent to stand in my way. Now, if my MS is about flying worms and the agent doesn't like flying worms, there's nothing I can do about that.