It's crazy I'm 33 and spend more time in my back yard in the garden then my 75 year old neighbor. It helps me relax.
You are not crazy.  Many people find gardening relaxing.  Myself included
I'm not even sure why I enjoy it. Maybe because it's outside maybe because I can escape in my own head. Who knows. Do you have a big garden? 
No, it is pretty small.  I just grow some various root veggies and a few leaf veggies.
I've got a little of everything. I don't even like the taste of some of the things I grow. 
Well growing veggies is good. Eating them is just as important.  Americans do not eat enough of their recommended amount
I also grow herbs and random things. I love being able to rely on my own garden. 
Are you a vegetarian?  I know many people do not eat meat out of respect for animal life
I used to be. But I'm a an athlete and needed the protein. I'm lucky enough to live in Amish community so I but meat that is grass fed and hand no chemicals used on it. Everything is free range. 
I really enjoyed the film Witness. Harrison Ford plays a cop you has to help an amish boy