Imprisoned in Myself

My life has always been normal. I never needed money, friends, or love. The thing killing me is myself. I overthink everything. And no, this is not a romantic nor fantasy story. This is just about a teen living their normal life. I don't have any problems with me nor do I have suicidal thoughts. I just want to end my life pea e fully after giving happiness to my loved ones. Basically my whole life will be about others and not me.