In my opinion, the truth is not easy. Here are a few realities I can share growing up in a "car guy" family, helping build my first house at 8 (not subbing it, dad and I built it), and growing up and working in the trades.
1. You have it or you don't.
2. If your family doesn't have it, I have some bad news for you.
3. You can do stuff, build stuff, but if you don't have it, you will struggle and have mediocre results.
4. If you have it, you know. The opposite is not always true.
5. The older you are when you decide to use it, the more difficult it is to accumulate the knowledge, the tools, the experience to be the best you can be.
6. You can still have fun, even if you don't have it.
I could go on and on. I had no doubt as long as I could recall that I had "it". I loved tools at a young age. Learned to weld by 6 (stick). Was playing with electric by 7-8, got into cars, was the top vocational student my senior year out of 4 counties, 3rd in the state in auto, and yet, was 12th over all in my class. Went to college on a scholarship for HVAC. My dad has been a mechanic, pilot, built 3 houses himself, his father, grandfather were both pipe fitters. Its on my mom's side too.
But today, its all just a hobby for me, and that is kind of nice. I miss it some days. Sitting at a computer isn't all its cracked up to be.