This is one of the funniest/weirdest threads I've read through in a long time. I've done so with a great big grin on my face.
But here's my sincere suggestion.
Make a list of all of the firearms you will want to buy and think you could afford during the next 5-10 years. Separate this list into two lists with a short lineup of 5 or so priorities. Then start saving and watch for a screaming deal for anything on either list on gb or forums like this. I'm 31, I started when I was about 22 and I currently have more of a collection than I thought I would ever accumulate in my lifetime. When I was your age my lists looked about like this:
-Custom bolt gun
Remember too, all of the money you spend on ammo is gone forever, most of the money you spend on accessories/parts you'll never see again, but money spent on plain old used centerfire firearms can potentially be used over and over again.