Relationships are more than sex, a lot more actually. Yeah you can have short term flings from sex, but a lasting relationship where you have to deal with bullshit in life, the daily routine, and not so fun things like finance, won't survive just because you like fucking.
Sure, physical attraction matters in a relationship, a lot, but I find a lot of my fellow fellas greatly underestimate themselves, both in personal perception as well as how women view them.
Most women are not extremely high standards "Stacies" that will only fuck chad thundercock, don't totally buy the demoralization there. There's plenty of women who are perfectly happy with most guys. You know what does turn them away though? Being a self-defeating sad sack doomer, especially one who jerks off over Nip pedobait characters.X