Is it too late to make career change in mid 30s? It requires me to start from entry level. Is it worth it?

It is never too late.  However, in your 30s you might have more obligations than you did earlier in life.  If you have a family and/or mortgage, etc. these will limit your options.
There have been many people who have changed careers late in life, people becoming doctors, authors, musicians, teachers, etc. 
If your dream is to make a change, sit down and come up with a realistic plan.  Be honest with creating the plan so that you do not give up.  It will take work and perseverance, but most people that I know that have switched careers have been ultimately much happier.

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