(NSFW) How can I become more than just "slightly aroused"?

I have a problem w/ sexual activities. I can not “get off” through clitoral stimulation, sex, oral sex, or masturbation. I’m 16 almost 17. I’ve been trying to masturbate for several years. I tend to feel slightly aroused through reading erotic books or “sexting.” But never anything more. And my boyfriend and I have been experimenting to try and find something that stimulates me past just getting a little aroused and wet. Nothing seems to work. I’ve masturbated using penetration and clitoral stimulation. I’ve used vibrators for both of these, with little to show from them. I’m currently on Birth Control. Its just gotten to the point, where I feel like ‘throwing in the towel’ and basically dealing with the fact that I’m just never going to “feel” anything ‘down there.’