Even though English Bulldogs sound like lazy easy dogs...they are pretty high maintenance. If you are wanting a dog that you don't have to do daily grooming to this is not the dog for you. Bullies have a shorter life span but there are bullies that have lived longer like around 12 years. My breeder has had quite a few live that long. As for expensive vet bill. Be ready to pay a hefty amount just to purchase your bully. No on here can tell you that there won't be expensive vet bills. Bullies are know for having some health problems but not all bullies have them. You could get a bully that is perfect and never has any allergies or anything wrong with it and lives a long healthy life. But if you are not wanting an expensive vet bill then I wouldn't get a bully because there are chances he can have something wrong or have to have this and that done and it all adds up. With strangers every bully is different ...my bully get along and lives everyone but you have some who are protective of their family.
I think your concerns about having a bully you should really think about it. Because everything you are afraid of can and might happen and if you are not wanting to deal with any of it i would go with another breed. They are awesome dogs but you just have to really research this breed and a breeder before you jump right in an get a bully! They are like no other breed of dog, they are different, and they are special.
Hope this helps my advice is do your research!