Hi Tara,
Yeah I'm sure he went to USA, the only thing that is strange on his boat ticket is the reason for his journey is "Going Home".  I have a hunch that he was reared by relatives in America from his childhood.  That happened in my mother's family and many others in those days because he was the fourth child in a family of eight.  I have found a Joseph Kennedy with a family O'Connell.  Maybe its just a coincidence but 'my' Joseph had a sister Louisa and I have a Bible belonging to her with her name and address in Westport, but it also has the name Sarah A O'Connell, Westport written in it...?  Louisa registered a marriage in 1889 in Westport (got that on familysearch.org) but her husband isn't named and she just vanished, maybe they emigrated, she doesn't appear on either the 1901 census or 1911 and its almost impossible to search for her when I don't know her married name.
Regards
Anne