Yup you are not alone and as mentioned children are just adults who have not finished growing up yet and we are not expected to 'bond' with every adult we meet but we are expected to treat each other with kindness and decency and respect and thats all we can do with those 'challenging or hard to love' personalities ~ over the years I have learned to 'fake it' with some children for sure ... I definitely am professional and offer them all the same experiences as the other children, encouragement and verbal reinforcements and so forth but without the natural bond / connection you develop with other children where it comes naturally for them and therefore for you to respond / interact with them ~ with some kids you need to make that mental effort to remember to do it daily and to remind yourself not to let them push your buttons!