I hate my Job

I would like to write about my job.

At In the beggining, my job was fascinating because I did not know a lot of things. and Every task was a challenge, tools were new and extremely complicated. But now almost two years later, I'm bored of doing the same things, dealing with same problems, and the same people [not sure if the "people" are your coworkers or customers.  Might want to explain who they are.]  doing the same exactly things. The tasks are so simple for me today that [consider using 'sometimes' instead of 'in certain occasions'] I have nothing to do. My boss is a jerk to be honest, and I hate him because he is not a leader. He is just a man who thinks that I'm a machine.

My coworkers are good people and but they hate my boss too, although they seems happy with their jobs. I think this is happening to me because I dislike to being a machine. and I need to find out new opportunities in other fields. Anyway... I'm gonna [this is slang, not usually used in written communication, unless it's to a close friend] take my vacations for making to make some decisions.

Greetings!

Although not technically incorrect, I'd suggest using 'and' less.  It will flow better in both spoken and written English, and will avoid run-on sentences.  Also, using commas before 'and' are optional.  I like using them.