7 yrs and this is my first AIBU, and I'm so cowardly I've name changed 
So... After years of renting crappy places dh, the 4dcs and I have finally bought a lovely house.
It's great. Needs loads of work doing on it. Lots of potential, completely neglected and now ours. The people who had it before us had some problems and had criminally neglected their animals. The house comes with a field.
Now begins the lovely story. A few years ago Some people passing by saw how neglected the horse in the field was and took it upon themselves to look after it. They did amazing things, built him a shelter, bought him food, trimmed his hooves, all of it.
The horse is a stallion and unbroken but of nice temperament. But it means he can be flighty.
Move on a year and one of the group has taken on most of the care and bought their own horse who now lives rent free in the field.
Two weeks before completion the owner tells us we will be inheriting a cat and that the horses are staying (he's gifted the stallion to the other horse owner)
So... We panicked until lovely horse person came to our door and seemed very nice, and we said they could stay until Easter and then we'd see (rent free).
This all seemed ok, but there have been annoyances: There's no where else to park but in our drive, when we want to wander around the field with the dcs we have to struggle through two horses and it's a nightmare, and now finally we have bought out longed for dog and I can't walk him on my field without someone with me because I can't carry a baby and a puppy and fend off the horses on my own, in December we were told they use one of our sheds for feed, And there are other people who are part of the group who have not introduced themselves to me, but who go on to my field regularly.
So this evening we've let the horse owner know that beyond the end of march we want our field back. At the moment I've used it twice since we moved in and I want to use it daily.
They're not happy. I tell a lie, one is not happy, the other is completely understanding.
I know they did a good thing, I know they put work into the field (shelter and fencing) but I also know they've had free pasture for 18 months in return, and I think it's become a picnic spot for them all.
AIBU? And should I be growing a backbone, because I'm already trying to think of a way to section off some of it, which I know would only end up delaying the inevitable? I'm also worried because I'm in no way insured to have this all going on on my property.
I want nice things for the people who have done good, but at the same time I want to enjoy my home. I also have PND and desperately want to be outside but can't cope with being around people. Just to throw that in there.