Born 8/25/1981 and the guy that I like is 7/18/1978. do you think were compatible?

Well, you are Rooster. To be honest, you and him are not very compatible though you both can be honest with each other. You both need to think carefully before you decide to get married. If you both agree that your marriage can benefit both of you, then you should make up your mind and do your best to manage you marriage no matter what difficulties you have.