A number of my clients have lived in Australia for many years but still have an 'accent'. As a result they are continually being asked, "Where do you come from?", when in fact they have lived in Australia for nearly 20 years.
One of my clients has had enough of being asked this question and has also developed a lack of confidence with his speech because of what he perceives as an 'accent'. He has developed negative feelings about his accent and becomes anxious when he has to speak publicly. I will repeat my mantra "Accents are good". As I have said before they contribute to an interesting world. However when they start to interfere with meaning and comprehension, that's when something needs to be done.
Of course if your confidence is low something can also be done about that.
If you really want to lose that 'accent', it can be done with a lot of hard work or 'yakka' in the Australian vernacular, from you.
Pronunciation Matters's courses can improve your confidence and make you love your own sound!