You don't need porn to masturbate. Anyone who thinks they "need" it either has no imagination, or they have a form of sex addiction.
Fact is, porn is supernormally stimulating. It's intended with the end goal of male ejaculation, and includes visuals/sounds/themes that cater to that goal, while making female pleasure an afterthought (if a thought at all). Not only does it do little to teach you what real sex is like, but it also accustoms you to craving increasingly extreme stimuli to be aroused, as well as more intense physical stimulation because you are rougher with your piece in your own hands than any vagina is capable of being. So if you get too used to getting off to porn, real sex will not be satisfying (unless the female partner does humiliating things she doesn't really want to do to try to get you off), and you can end up experiencing performance issues because of it.
TL;DL -- If you've gotten to the point where you "need" porn to ejaculate, you have developed a problem. Enjoying adult erotic entertainment is one thing, "needing" it is quite another, and relying on porn too much to achieve orgasm can *and will* contribute to an inability to be satisfied from real-life sex. Erectile dysfunction is awfully embarrassing when you're only 19, bruh.