Before becoming sexually involved, it is important that you and your partner discuss the issue, not just before the act itself. If you are a virgin willing to wait until you are in love and/or married to engage in sex, it is necessary that you make your boyfriend aware of that at the beginning of any relationship. If he cannot handle it, maybe you shouldn't be together. A man who cannot respect your decision on sexual abstinence is not someone you need to be with it. Don't feel bad: pat yourself on the back for being someone with self-control, who is willing to save the best for the most worthy.
If you wait until you are just minutes away from the act to talk, it will definitely be harder. When you have a moment together and won't be interrupted, it is best to take a time like this to discuss the topic of sex and find where you each stand on this touchy, yet vital, issue.
Don't think you can do it? Well, then, talk to your doctor; ask what methods are considered the best and most affordable. But don't you ever forget that there is no sure protection from pregnancy and STDs like abstinence!