Honestly, what the human body enjoys and fantasizes about can seem really bizarre when looking at it from an outsider perspective, but it’s not abnormal. A lot of people are turned on by many different things, and there’s nothing wrong with you if you like things on the kinkier side.
When you do decide to become sexually active, and this goes the same for anyone I talk to who isn’t necessarily into kinky things – make sure you feel you are ready. Make sure you feel you’re ready, make sure you’re informed, make sure you’re in a frame of mind to enjoy it! I would do a great deal of research regarding safe, sane and consensual bdsm practices if you decide to incorporate them with partners in the future – MAKE SURE your sexual partners do the same, because if there’s any miscommunication it can lead to serious misunderstandings or damage. If you do not trust someone, do not engage them. You will regret it.
I had a lot of kinky fantasies at your age, and younger, including consensual non-consent fantasies. Whether or not those fantasies are a by-product of the romanticism of rape in our society though…that’s a bit trickier.
We can’t necessarily control our desires, but we can control how we respond and react to them, and we can decide what kind of external stimulus we invite into our lives. Because we have much more easily accessible exposure to sexual things, including those of a kinkier nature, perhaps these desires are easier fueled?
Sorry if I went on a bit of a tangent there. The main point is – no, you’re not alone, and no, it’s not a problem. Not everyone will understand it, so it’s important that you talk about these kind of things in safe spaces with people you trust.