Hi Bug_l, and welcome to the forums, it's good you have posted a comment.
Whatever your sexual denomination you have a feeling for is your choice, it's impossible for a parent, friend or family member to try and think they are able to change how you feel because it won't happen, even though they feel a responsibility for you, it only aggravates the situation.
You may not have to do this temporarily, as your doctor can give you a 'mental health plan' which entitles you to 10 Medicare paid sessions, and they will be able to help you in regards to coping with your parents.
You can also contact Kids Helpline 1800 55 1800 up to the age of 25 or perhaps 'gendercentre.org.au' where they have a form to download for counselling.
Please let us know how you get on.