Christians, how would you define a "true Christian"? How does it differ from a regular Christian?

All Christians are christians if they believe that God sent his son to die for us and that he rose again in 3 days and will take us to heaven (If you believe on him). However, some christians serve God more because they don't get distracted by the world and it's music,tv, ect. It's hard to be as committed as the 1st century church (Paul, ect.), but a "true Christian" as you call it is willing to serve God no matter what he/she has to give up because God is worth it.