Great work reaching out. I know it has been said so many times before, but as the famous saying goes, the first step is always the hardest (or something like that). I think there’s a lot of truth in that :)
It sounds like you’ve been struggling for a long time...that must have been hard....
I would gently suggest perhaps clicking on the “Find a professional” link on the BeyondBlue website. There, you can look up various professionals for different services.
Sorry, I know you were asking more about groups, in which case, perhaps you might like to give the BeyondBlue helpline a call on 1300 22 4636. Their counsellors can probably offer recommendations about support groups. Plus of course the forums here is great online peer support :)
I hope this gives you a few ideas...