Realise today that if your approach is not working it needs to change and sometimes you wont get the results you want.
You will have to accept today that things wont always work the way you want them to. If the approach you are taking to something is not getting you the results you want do not keep pushing it, realise that a new approach is needed. Sometimes you even have to accept that what you are trying to do is not going to work at all, it's tough, but wise up.