how do I fill this empty space?

woke up late on a weekend got out of my bed like at afternoon got no appetite, and it’s nothing new something’s wrong with me, yeah it’s probably one of those phases but knowing that won’t change how I feel inside so depressed and upset, hate myself when I’m like this why do I feel so lonely, lonely? it’s not like I’m really alone, alone yeah how do I fill this empty space? is it my heart? is it my brain? I wanna be the old me, old me he surely knew how to love me, love me how do I fill this empty space? is it my heart? is it my brain? always want what I can’t have and everything I’ve got doesn’t feel so green maybe I’m spoiled, maybe I’m just blue something’s wrong with me, yeah I tried my best not to show it but it’s getting harder to keep a smile would you hate me if you know who I am? why do I feel so lonely, lonely? it’s not like I’m really alone, alone yeah how do I fill this empty space? is it my heart? is it my brain? I wanna be the old me, old me he surely knew how to love me, love me how do I fill this empty space? is it my heart? is it my brain? ah-ah lonely lonely ah-ah lonely lonely yeah ah-ah say you love me how do I fill this empty space? ah-ah lonely lonely ah-ah lonely lonely yeah ah-ah say you love me how do I fill this empty space? why do I feel so lonely, lonely mmh, yeah mmh