@jufa,
Hi, :-)
It is true that our thoughts and our actions set things in motion and that we reap the consequences. In a full sense it is not true, however, that everything can be explained on the formula that you reap what you sow. It is also not true what the title of this thread says, that "everything in your life results from your actions", in other words the same superstition that says that everything is explained by the formula that you reap what you sow.
If I get hit by a car or if a bird poops on me, surely that does not have to mean that I caused it to happen. If you believe that I did necessarily cause it, then you are into make-believe ideation. Long lists of examples could be made where the formula that you reap what you sow does not explain anything or describe the chain of events in a meaningful way. In fact, it is almost impossible to pin-point a situation where nothing else besides yourself influences you. You get the point, I hope.
The same can be said also about thoughts and feelings. You should not blame others for the feelings and the thoughts that you have. On the contrary I advise you to see yourself as the master of your thoughts and of your emotions. The only caveat is that I do not believe that it is beneficial to go full control freak in doing so. Additionally, there was a time in everyone's life when he or she was not acting consciously, for example when the individual was a toddler.
Any involvement in relations with other conscious beings does involve placing yourself in a position where others have more or less influence on you by necessity. If they have no influence on you then there is no relation. As a matter of fact, relations with other people open you up to their influences to some extent. As soon as you have some kind of relation to another, it is possible for the other to cause you to think and feel things, and the level of causation can oftentimes be thought of as corresponding to the level of your involvement in the relationship.
The other party in the relationship plays a part in it, and it follows that the other party does causate what you think and feel to some extent. You do causate a lot of what you go through in relationships, that is true. But you do not causate everything in them. And there are relationships that you cannot reasonably escape unless you want to always run away from situations that involve other people.
Also, everything is more or less connected, and so it follows that everything else besides you influences you to some extent all the time, actually. The thoughts that I have outlined here have a much wider scope than what I have presented. But this is less obvious, and so I have largely skipped it, focusing on what is more obvious.
By the way, could you explain to me exactly what you meant when you wrote this: "Never give power to anything a person believes is their source of strength"!?