If you have enough visible clues, it's likely that you would be gendered as a young male. If so, you should have no difficulty in the male bathroom. If people's attention isn't drawn to you of some reason, they don't consider your gender and you will pass with far less difficulty. In the male rest rooms, normally it's no conversation and no looking. You go in, do your business and leave. This is somewhat different that the women bathrooms where they can become a social center.