cruel joke

I'll always be pretty enough to be with but never pretty enough to stay with maybe I was cursed maybe it was an extremely cruel joke but I will never be enough to love but to want until that want is gone to throw me out like garbage repeat over and over I've learned my lesson so many times I'm sure I'm an expert in this subject why am I still learning it..? Pretty enough to want but not pretty enough to keep guess the joke is always on me