Sex problem

Anon or delete, please. I'll keep this short. Privately, (by which I mean between myself, a tub of vaseline and my right hand), I'm highly sexed and liberal/fairly kinky with my material. However, when it comes to the idea of women I may possibly be interested in the idea of them having done sexual things with other men enrages me and makes me feel bitterly jealous. Almost all of this feeling is concentrated in the act of oral sex and especially the ejaculation of semen into the mouth / onto the face, which, in private, is my sole sexual focus. What could be wrong? Is this just a part of maturing (I'm 19) or is it a psychological problem? I know it is possessive and is making me desperately anxious and unhappy. Do any other guys have experience of this, and does anyone have any advice on overcoming it? Thank you.

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