If it is to be, it is up to me.
I think that this means that if you want to accomplish an activity, it will be on how hard you work on it. Like if you think you can lift something that everybody that had tried which they couldn't do, then don't doubt yourself in I can't do it either. If you fail to reach the goal that you wanted the first time, then continue on working hard on it and you will reach that goal that you wanted. Also, if you feel like that you can't do it, just give yourself a little break then get right back to it. So thats what i think that the quote, "If it is to be, it is up to me," means.