I am due to get braces next week

I have more or less a mouth full which include front some fillings! all of which i have had from my teens!! This purely down to not looking after them when i was young

Question is do you think i am doing the right thing? Would i have been aswell going the cosmetic route i.e using crowns or veneers to straighten my teeth now?
Do any of you guys have a lot of fillings? mostly all the progress pics i see you all have such great teeth (except alignment) in the first place.
My biggest worry over my teeth would be needing dentures


You can see pic in my braces story below.... think i'm having those last minute nerves of 'OMG what am i doing?'