While there is a huge debate about fate vs free will, you can definitely still acknowledge how what you do affects your future. Whether you have a predestined path or a mix of that and free will, you still need the right mindset. It might be provided to you at times by a higher power, maybe karma from a past life or other factors. At the same time, we are to have the right mindset to go about our days.
Astrology has an interesting discussion of fate versus free will. Astrologers will say that it is a combination of both. That in your astrology chart there are fated things that will happen, and then there are times when the influence of the planets require a decision to be made to go in one direction or seek other choices for a different way.
However without the right mindset, we are turning away from what we are supposed to be doing. Let's imagine that you're working hard at your job, and everything starts to go wrong. You feel like walking out, and you have a decision to make. Do you walk out, or do you stay? There are so many decisions that people make that affect their future. Think about the decisions you make daily with all kinds of relationships. Think about the people that come and go out of your life.
There are so many different factors that influence your life, and there are so many things that you allow to influence your decisions. Some of the smaller decisions may seem very insignificant, but those decisions and their outcomes can build up and also lead you in all kinds of directions. Forget decisions for a minute and just imagine the difference between thinking positively or negatively. What if you were always paranoid, always a perfectionist, always thinking from a negative standpoint?
If you thought like this all the time, there is no way you would get much done. You have to be thinking positive, and you can't let what happens wreck your day. You can't let what other people think about you bother you to the point of insanity. In all seriousness, you have to maintain a positive image, stay true to yourself and think positively about working towards your goals. That may sound like a self help speech, but it's just the truth.
Think about how you are in control of your attitude. For sure, many different kinds of things can happen, some of them being harder to deal with than others. Still, you control your attitude and how you deal with everything, and that has everything to do with what happens to you as you keep going. Your mindset helps make your decisions for you, and so make sure that you are headed in the right direction.