First day without a ciggie

I am 20 years old, Iv gone 2 years of smoking and yesterday my partner has constantly asked me to quit because he's worried about my health & for my future and children. Today was very hard considering iv been craving one all day and knowing my dad smokes it really triggers me into buying another packet only because it helps me stress less and calms me down. But I feel as if I'm going insane without one and I have an e-cigarette to help stop the craving but it's not really working. I don't know what to do. Someone please help.