'
You're following behind but I'm only running forward' - everyone's trying to copy them and become equal to them, but they're getting better and better at a faster rate, so no-one will ever be able to catch up with them.
'
I jump on top of the table you’re sitting at, I don’t care' - this is simply a reference to the fact that they can do whatever they want, with or without reason, and still not worry about being judged. It may also be reference to the group's 'in your face' attitude.
'I don't care' may also refer to another of their songs, released under the title 'I Don't Care', in which they sing about remaining unaffected by a break-up.