Hi Ren77. 
Thank you for posting your question and photos. I can understand how the degree of asymmetry between your breasts would have made you very self-conscious throughout your life. Correction of this degree of asymmetry will likely require more than one stage, and occasionally more, in order to get them not perfect but as close as symmetrical as possible. 
One option is to have an implant on the left side and a reduction/lift on the right. Another option would be to reduce/lift the right side to match the size of the left followed by implants in both. It depends on what size you desire to have and what would match your body size and shape. Remember also that private health insurance may be applicable in some (but not all) aspects of breast asymmetry correction surgery.
I hope this information helps.
Kind regards,
Dr Ray Goh