I used to be in your shoes: a teenager who desperately wanted to travel but had never left my province in Canada, whose parents never took me travelling, facing very expensive university years. My family was not well off, and at 17, I really thought that I wouldn't be able to travel overseas for several years - that maybe I'd start being able to afford trips in my 30s, if I worked hard and paid off my student loans by then. I wanted to travel so badly that my situation honestly made me cry sometimes. I remember how frustrated and desperate I felt back then. But:

You'll surely develop a better sense of direction as you spend more time travelling and learn to depend more on yourself. It's a bit of a trial by fire and will be hard at first but I'm sure you can do it. At the very beginning you can start by over-planning, printing out maps and clear directions, leaving early before flights/trains etc to give yourself lots of time, until you get better at it and feel more comfortable travelling. You can always practice with smaller trips closer to home before you go abroad so you're not totally overwhelmed by being in a foreign place.