I completely believe that humans are easily swayed. We are socialized from birth to learn about life and its experiences from other people. A nurturing family, in my opinion, creates a dependency on others for decisions rather than figuring it out for yourself. Positive reinforcement is also provided when you make decisions that others want you to make. Influence in and of itself is not a bad thing; it is how we interpret that influence that matters.
Yeah I think people are easily influenced due to the fact they could be scared of being judged by others or want to please others. Additionally, if you're young, you might be more impressionable.