Well at least it seems you've thought about the costs...more than some ever do so that's a very good start.
Add 15% to everything and then probably 10% to the final total to be sure. Add15-20% to any times just in case and divide your expected salary on starting by 2.
Strongly, no, STRONGLY, recommend preparing to do to university - a university degree is VERY different from school.
If all fails, take a year out travelling; broaden the mind and come back to all this with a fresh perspective.
Good luck in whatever you do
fc101
E145 driver