what does it mean to love God

As a christian, what does it mean to love God or how does one learn to love God? What if don't know if you love him as much as you fear him? You love your friends, your neighbor and your spouse as you grow closer. How do you know God loves you? His word says he loves us and he gave his son and we receive his gift of salvation, but how do we fully receive his love if we don't feel his love toward us at times?