I'm 23 and few years back i used to feel the same about my life. But soon i realized that the worst thing i could do to myself was self-pitying and putting mysefl down. "If you feel worthless than work hard "is what i told myself, if i stutter and can't express myself than i can only work harder than others and make it up and this way i found out that i'm better at so many things than others ! For example i can retain more information, i pay more attention to written stuff and also i'm a good listener. And i bet you're also quiet similar and have alot of different hiddeb talents onky that you are way too busy looking at things you don't have. I say you should reflect on yourself, meditate more and never give up. Now that it's autmun you could go around for a long walk alone while listening to some music or just talk to a wise person.