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mentor is not bad thing but it's true we shouldn't following a mentor blindly, they can tech you or guide you then your journey will be easy, or you can reach in your target a bit easy. but everything is depend on you because you need to properly execute your plan in the right time then success will come, a mentor can not change your life.
A mentor is just a general guide to something we don't know yet because maybe he/she is more experienced in certain things so we call him/her a mentor. But in many ways there is also truth in what you said that a mentor is not someone who can change everyone's life because basically everyone must be more disciplined personally for themselves without associating anything with a mentor. So each of us needs to understand and place this more precisely so as not to consider a mentor as a savior god in life.