It's interesting that you are honest and not at all ashamed about being mediocre. Since you said something interesting, enhancing my knowledge a little more, I'll give one paragraph a vetting.
Well, actually, first let me be honest. As a rule of thumb, I think most people choose to be mundane because they let fear dictate to them, and the false security suffocate them. You reinforced that notion in me a little more with your honest confession to being a docile sheep.
Oh yeah, about your essay.
"To start with, I must admit that changes are always inevitable in life and provide challenges to life, which make one fulfilled and energetic throughout the tedious world. However, there are still a majority of individuals, including me, who prefer doing the same things and avoiding change. Here come the following reasons to support my view."
Kevin already noted the anemia in your opening sentence, so I won't beat a dead cat.
Are you talking about change as a concept, or changes?
Always doesn't always modify (pun intended -- I have to get some humor out of this) inevitable very well. This would be one of those times.
Did you mean to say challenges IN, or to life? (If you're going to stick with that sentence, life wouldn't bear repeating).
How "throughout a tedious world?" try "in a banal world." or try this ...energetic -- enough to overcome the banalit(y/ies) in life/of life. (Of course that is your view -- some people try to think fresh every day, and all the time)
Hahaha, you're not incorrect in saying "a majority of people."
Is one line (the middle one) all the breath you have before you start gasping for air?
Take it as a rule that the opening sentence, thesis, topic sentences, and conclusion, are most important in an essay.
You dropped the ball on the opening sentence, made a big improvement with the second one, and completely passed out on your thesis.
It's very ironic and humorous. Have you ever read the templates that go [insert xyz here]?
It seems you left the template for the thesis in its original state. [Insert main reason/talking point here]["Here come...reasons..view"]
Now all you have to do is fill the template. Good Luck.