why is so hard finding a nice, pretty , monogamous type of woman for girlfriend ( not everyone's girlfriend )?

i always meet the wrong ones , it's either :
1-she's taken ( in love with some guy or married)
2-doesn't like me( not her type) or because i don't have money or career but she's just the same, lol
3- is a lesbian -
4 -is a player and won't be your girlfriend , she's everyone's chick, lol
5- she's mean and nasty and is looking for a DUMB A to put up with her BS