The answer to this question depends on what you want from life if you are looking for money, then yes, but if you're looking for meaning and purpose, then no.
You don't need to be a mechanic if you don't know how. It won't make you wealthy. It won't make your name famous. It is unlikely that your life will change.
This would require you to spend many years learning how to properly do everything. You would still need to hire someone to fix your car if it breaks down. Most people won't bother to do it. They find something more worthwhile.
Summarising, if your goal is to make lots of money, go for it. The mechanic's profession is not the right place for you if it means that you will live a fulfilled life.