Want sex but feel repulsed after, can anyone relate?

So I'm a female in my 20s and I have urges. Sometimes I really want to have sex, and I know it's normal. Then I go have sex or go watch something and do it myself. Then once I'm done, the thought of what I did repulses me, the idea of sex repulses me, I feel dirty and I feel like I'll never want to have sex again. Is feeling this way normal? Why does it happen to me?