Let the doubt drive you closer to God.

If you are walking the narrow path right now and living in a way that pleases God, then more than likely there was a time when you were not. There may have been a time in your life when the path you walked was wide and you were conforming to the worlds ways. If so, you may still have people in your life that knew you then and doubt you now. Do not be discouraged by them. In John 6:42 they doubted Jesus when He began His ministry saying "Isn't this the son of Joseph. How does he say "I come down from heaven?"" No, Jesus didn't come out of sin, but they did think he was just a normal man. So when you change your life, don't be shocked when the people who know what you came from doubt you. The best thing you can do is represent Christ well, pray for them and do NOT let the enemy convince you that you are who you used to be. God can change anyone and He does it all the time. He also can use them after they have come to Him to reach others. Continue to walk the narrow path and know that, like Jesus, you may be ridiculed for it, made fun of and doubted. But that is what makes it such a narrow path. Not everyone will choose to walk it. Ask God to help you stay strong, pray, love and continue to let God show you the purpose He has for your life.