aim high, high as the sky
and if you get anywhere - even if it's not where you wanted to - then there's absolutely no reason to feel bad, because in contrast, if you had aimed low, you wouldn't have gotten as far.
Really if you're going to aim low, and 'exceed' your expectations, you're lying to yourself.
This is because if you recognise you're aiming low, then you're not being realistic with your aims, and so the 'surprise' will really be a lie, and you will not surprise yourself when you exceed your low expectations.
Here is an example, albeit extreme, it demonstrates it well.
"An above average student goes into VCE. Think, "I will aim for a 15+ Study score in each of my subjects". Studies accordingly, averages a study score of 25". Tell me this guy would be happy with his results, and you've got to be kidding yourself.
aim high, live like a king, never lower your standards it won't get you any further.