Hey there, a few things that might help/be informative:
It's done now - try not to dwell too much on what could have been or things you regret. Try your best to just worry about working with what you have. There are many, many pathways to and through uni, so I can assure you that (if you are open minded and determined enough) there will be one (or many) for you.
First things first - there are certainly lots of courses that you can get into with an atar of 70, particularly with bonus points, though this does depend on what area you want to study. If you want more specific advice on paths to uni or courses etc feel free to reply with specifics (ideal degree, areas of interest, no. of bonus points, etc.) and I (and others) will be more than happy to help. But all good if you don't want that.
Secondly, many uni's have pathways to study that do not require an atar, or require a reduced atar. E.g. UTS does UTS college for this. Often these sorts of programs involve doing some sort of diploma, specifically targeted at preparing you to study a bachelors degree. If you are unable to get into uni directly, consider this as a pathway.
Also, the selection process from atars is far simpler than you think (for most degrees). Your bonus points are automatically applied, giving you a 'selection rank' for each uni you apply to - they then just go from the top down and make offers to however many people they want to. The fact you got 70 really doesn't change anything other than your selection rank. There are heaps of courses that you can comfortably get into and more you've got a very good chance of getting an offer in some round through bonus points. Most uni's publish an atar but depending on how many people apply for that degree this year, let in people with selection ranks a bit lower than the published one.
Another thing to consider - if you have a "dream" or ideal course and/or uni that you cannot get in to, try to get into another course (the more closely related the better) and if later on you still want to do that dream course you can transfer into it (and hopefully get credit for similar subjects) or transfer to another uni if you still want to go there, and continue studying. This will often require certain marks from uni (particularly a weighted average mark (WAM)). It depends largely on what area you are studying, but often you can take the same (or very similar) subjects across degrees to get experience in the area you are truly interested in. In first year you may have electives where you can take subjects from any faculty across the uni, so you have lots of options, even if you dont get the atar for your desired course.
Last thing - obviously I don't know your situation and I don't want to assume anything. But i feel i should mention that you should really consider if you can go to another uni other than anu... every uni has its strengths and weaknesses, and once you are there often its not as bad as you might expect. But obviously if thats really not an option then thats the way it will be.
In short - you still have lots of options and opportunities - there are plenty of things you can get into with an atar of 70, and options to study things that normally require higher atars. If you want more specific advice I would need to know what you want to study and a rough number of bonus points, but no worries if not. Good luck! Remember you have time... you might not get what you wanted just yet, but you certainly can later on if you set your mind to it.
