wvmtnkid and mr. cheese and ktf gave excellent advice and prayers. I echoe what they said. I know it is hard, we all know it, because we have been there, and the struggles don't end, you just get a little better at dealing with them (sometimes).
Perhaps you need something to replace your old fun life with. Maybe if there is less time to yearn for your pre-Christ life, eventually the desire for it will diminish. Are there church meetings, prayer groups, youth activities that you could participate in. could you think about spending a little time with the Bible, when you feel this way. Perhaps reading the gospels of the New Testament would give you the opportunity to "see" just how Christ suffered and was persecuted, the temptations He endured and the testing of His faith.
You are not alone in this, we all want to help you. I will pray for you. Falling in love with Jesus is like falling in love with a person in some ways. There are the initial feelings of anticipation and excitement, followed by a more subtle and subdued and more fulfilling heartfelt love.
It isn't always going to be exciting, but the times we grow more as Christians are at the most testing times of our lives, when we draw nearer to God through prayer, through allowing Him to support us, by allowing Him to hold us upright when we feel like falling down.