I feel depressed because of my teeth

So last year I lost my second molar, because of my bad habits as a kid I'm a 18 year old male And I'm wondering if I still can recover from this. I still have so many cavities like 6 teeth,and I'm trying to do my best to save my remaining teeth so it will not happen again, but the hard part is that my family poor,but I think my prayers has been answered because my missing lower tooth is getting replaced by my wisdom tooth and it a relief. I promise to my self when I finished my study I will fix my teeth because I feel sad and disappointed.