Here is a passage from Acts that puts the decision of when to follow Christ into a good perspective for us all...
37¶Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?
38Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
39For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.
40And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.
The moment they felt something in their hearts they desided to change. Not only did they think to, but they immediately did. Words or a desire can only take us so far, life does not change or improve until we act. Christ and his teachings become a reality as we live them. I know this to be true. Choose Christ now, don't wait for tomorrow, or put it off for another day, but make the choice and act!