Uncertainty about your sexuality can be quite difficult, particularly if you are already in a relationship with someone of the opposite sex. The good news is that it doesn't usually last and represents, for most people, a period of confusion through which they pass and end up feeling more comfortable.
Confusion about sexuality can certainly affect your
mental health. This might be reflected in insomnia or problems sleeping, difficulties with concentration, being more forgetful or mood swings. It can help to
talk to a gay friendly counsellor. Anxiety and depression are serious conditions that anyone can experience. But if you have something you feel you can't tell your partner, friends or family, it is much better to get help than to suffer in silence. Make an appointment with a doctor if you are not feeling yourself or feel at any risk and be open about how you are feeling (there is a list of
gay friendly doctors in Australia on this site).
Just because you are confused about sexuality does not necessarily mean you have to make a choice between men or women. For many people this is a surprise because, in current times, there is a lot of pressure for people to identify as either 'gay' or 'straight'. This is just one way of viewing sexuality but also quite limited. You might decide to explore your sexuality through
dating someone of the same sex. You might prefer to discuss it with a therapist or counsellor. Whatever you decide, keep in mind that it can take some time but usually it gets easier when you know yourself and your sexuality better.