I haven't been to the dentist in years. I don't intend to either.
Why would you avoid going to the dentist?
I don't like spending money on myself
I understand you don't like spending money on yourself.  However, you really need to at least spend enough to take care of your health.   You've got nothing if you don't have your health!
I don't care. about myself anymore. I could die, but like who cares.
Many people care about you and you should make an effort to take care of yourself physically otherwise you will fall into sickness. Start taking care of yourself and you will see that your self-love will increase commensurately.