Dear f4af2007,
Sometimes pleasuring one another orally works for some without penetration. Sex is a wonderful thing, but things just come naturally. When making love your mind should not be on what comes next or will I have an orgasm. From your posts, it seems that when it came to doing it orally, you were pleasured and your mind was probably in LaLa land. But when it came to penetration, your mind focus on something else. Just let it come naturally. You are young. It will come to you. Just give it time and do not this frustrate you. Hope this helps!