As tempting as it seems to wear tennis shoes with your tux, don't do it. I think it looks ridiculous. If you're 14 years old, maybe give it a shot. In general, don't portray anything that says 'I'm too cool and I don't care.'
I really didn't have an interest in being in the kitchen until after I was married, when I was 18. It didn't take me long to realize that Mama was not going to show up at my house every day and cook.