I can't catch feelings for anyone

i'm a girl constantly surrounded by all genders and i just find it really hard to be interested in someone for longer than (roughly) 3 days. boys always end up liking me quite a bit, honestly, though i'm not sure why and mutual feelings just don't really sprout. i'm not emotional to begin with, but i'm in love with the thought of love, though whenever i try to put someone in the blank space of my lover it sorta weirds me out, unless i'm listening to a song or reading a poem because that is when it doesn't feel so weird to be dependent with someone. and it sort of goes the same with sex, i don't like having sex with other people, but i absolutely love doing it myself. i just don't know if this happens to people often or not. (seeing that relationships are often glorified by media)