I have to agree with Satya, You have to think very carfaully about taking this on alone and what support you will have around you, and how they might react to your descion.
I suggest you talk to a GP, or someone from your local (NSW) family planning clinic, EG: FPWA (family planning of Western Australia).
I think you should talk to some one you can trust and who's opinion you value, or you could find a GP or a psychologist who might be able to offer some advice and work through these feelings of loss with you.
You need to be sure you are doing this for the right reasons and be 100% confident this is the right descion for you.
I hope you find some answers.