Please share your methods to dealing with the relationship with others!

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1, I offended my leader when I was in college, he said that I was not careful enough with my work in the Students Union. I feel it was not fair to say me like that. I am not good at flattering so I am always working without showing to the leader, I don't know if this is a problem to do like this. 2, I've worked for almost a year. I am an outgoing person but when I talk to the boss I feel I am another person not me myself because I would always keep silent. Please share your idea about this, I am always suffering from this problem on me, I hope to find some way out of the situation like this. 3, I know it is important to deal with the relationship well with everyone, but I always would like a communication with workers not the boss, I consider this as a big problem but is there a way to change my personality?