The above posters have given some excellent suggestions. I second them, and would like to add that the cornerstone of all healthy relationships is communication. If your boyfriend doesn't know you feel like something is making you feel uncertain, or even unhappy about the relationship, you're not going to be able to work on it between you. Likewise, that goes for your boyfriend, too.

Talking about feelings can be scary sometimes, but when we value people as much as you seem to value your boyfriend and this relationship, it's important to bring stuff like this up. If you aren't sure what you want to say, you might possibly consider writing it out beforehand to practice what you would like to say, or talking it over with a close friend or supportive person, who might help you gather your thoughts better.