OP, Congratulations on your success! I have never known an UNsuccessful person to purchase a NEW home

The new neighbors should be grateful, but alas there WILL be resentment. You are wise to know that.
Regardless, enjoy your new home that you worked hard to build. While ITA that you need not a chip on your shoulder, be aware, and not overly anything, and you should do fine.
There is a recent trend of old homeowners trying to bully and goad new homeowners. DO NOT ENGAGE. Hopefully this will not be the case with you, but it is becoming very common, predictable, and well known in this age of new home construction.
Face it, most of the old homeowners would never be able to own a new home in their own neighborhood right now - or they would! Given the choice, didn't you yourself choose a NEW home??!! While some of them may be fine with this, some are not.
My friend lives next to the neighborhood whacko who used to reside in (my friends) new house when the whacko neighbor was a student renter. The whacko bought the next door house on foreclosure. I swear my friend hears his blood boil every time a new house is constructed. The other neighbors ignore his inaccurate gossip and goading, as he has a bad reputation (he made it for himself), and he has gotten rather desperate in recent years. The whacko neighbor resorts to anything - slander, libel, trespassing, mobbing, you name it! Hopefully you won't have one of those. But I must say, their neighborhood really is becoming more and more beautiful by the week.
I would be grateful and not complain if I were in an old home. The new homes pay almost twice the taxes of the old homes, and practically carry the tax base.
Enjoy your new home in good health and ignore any troublesome and/or troublemaking "less than"s - it is their BEHAVIOR, not their money, that makes them so!