Tiffany,
No, temptation is not a sin.. temptation is common to everyone, yes, even Jesus. What is the sin, is when we give into temptation and carry it out, either in our mind or in our behaviour, and this is why the Bible is able to say that Jesus was tempted in every way that we are, and yet was without sin. Hebrews 4:15.
It's not the temptation that is the problem.. it's our reaction to it that is the sin, and as Aineo says, it's because of that we need to repent (turn aside from and tell God we are sorry) for our sin when we do whatever it is we have been tempted in.