(Just a little back story) As a young child I began researching the Career choice as a mechanical engineer. I did start college after high school, but was cut short due to fund shortage and economical problems. I am now turning twenty-two and have recently applied for a university. I am now able to support myself due to the real world knowledge and experience I have gained as a diesel mechanic. I know I have always wanted to find out why things work in the world, discover solutions using math and science, and the ability to feed my self with factual evidence of mechanical items that function on a day to day basis around me. But, I still have self doubt in myself... what advice does anyone have to over come such doubt and worry?