On the Internet, there are many different quizzes pertaining to the compatibility of you and your boyfriend. You will be asked several different questions about what you and your boyfriend are like, what you like to do and things like that.
Then it will let you know if you are compatible. This way is not definite. Even though there really is no definite way to see if you are compatible with anyone, there are more sure fire ways. One way includes seeing a counselor or therapist who specializes in compatibility.
You will have to pay for their services, but they would ask you question. You and your boyfriend may have to see them several times, but they could let you know.