Check out these two sites:
They each have a quiz you can take to determine whether your stuttering is a problem or not, and how severe it is.
If you just have a mild stutter, it may not be worth it to you to seek professional help. There are tips online, at sites like these:
If you decide to seek professional help, you can locate a Speech-Language Pathologist in your area by visiting www.asha.org/proserv
I am a Speech-Language Pathologist in Southeast Michigan, USA.