hey there and welcome to SS (sorry you're here)
it would be best if you finish high school. i don't know where you're from, but in some places it's common to do a gap year before going to university. you can use that time to travel, do part-time work, laze around, whatever you wish; until you decide what you want to do later.
during that time you may either find that you want to do a course that interests you, continue working, or use your savings to catch the bus.
whatever you decide, i wish you the best!