Love hurts

I'm only 22 and Im tired of giving my all to people. It hurts to fall in love with someone that doesn't love you back. Words can't express how I'm feeling right now. I feel like my heart just shattered on the floor and I'm trying to pick up the pieces but they keep falling. These tears that won't stop rolling down my face no matter how much I wipe my eyes. Why doesn't he love me? Why am I not good enough for him?