This is what a lot of people have said to me in the past, but very few people know that that the ATAR is more than just a number to me (it's a long story). I appreciate your help though.
I thought the exact same way as you last year. I really wanted a 90+ ATAR, but most important of all was that I really wanted a 50 in specialist maths. I know that looking at my score now, you're probably thinking "you weren't even close, you got nowhere near a 50, you shouldn't have set such unrealistic expectations for yourself", but I was getting 100% on most of my SAC's and I got either 39/40 or 40/40 on the tech-free exam (depending on some technicality in one of my answers), so I was actually pretty close, until the very last hurdle, the tech-assist exam...
But now I realise that, although it would've been nice to get a 50 in specialist maths, it's one of those things that you can brag about to a few people or think about to yourself when you're alone and need some cheering up, but at the end of the day, it really isn't adequate or necessary to achieve happiness. Once you get caught up in other things: university, work, buying a house, marriage/social life etc., you'll find that the ATAR bears a very low significance on your life, even though it might seem like a huge thing now. Imagine it like missing out on a grade 6 award. Yes, you might look back on it once in a while and say to yourself "I almost got that award", but in the long run, it really doesn't matter that much. It's just one of those tiny little insignificant things that you forget about for 99% of your life, until one day you become really bored and start reflecting on little things that happened in your life. But I doubt you'll get emotional about it. For the first few weeks you will, but after that, you won't really care about it.
Good luck on achieving your ATAR goal, but remember that whether you reach it or not, we won't judge you and I'm sure that you will soon come to terms with whatever you get.