In cultures where men make the first move, women tend to develop a good idea of the kind of men they're able to attract. For example, women who are are obese, disabled, and mentally ill know they are only able to attract men that are much less desirable than average. Men, due to not having women approach them, are sometimes completely clueless about the kind of women they are able to attract. This can result in men with major character flaws, mental illness, and other undesirable traits pursuing women with average or better attractiveness, good personalities, or successful careers without realizing these women are so far out of their league that they will never be interested in a relationship with them no matter how hard they try. It's the equivalent of pursuing a job as a doctor or lawyer when you never went to school.
In reality, I think it is just as easy for men as it is for women to find someone. Since there is an equal percentage of men and women in most countries, men just have to realistically asses themselves and pursue women who are more suitable for them (meaning women who are in a similar situation as themselves). This might mean pursuing women who are obese, mentally ill, or disabled instead of women with above-average looks, great personalities, and successful careers that most men would prefer.
An important lesson in life to learn is "You can't always get what you want." Sometimes you have to settle for things that are more appropriate given what you have to offer or put in the hard work improving your character, personality, and appearance to help get what you want.