Why is it easy for some people to find a partner right away?

My dad cheated on my mom for 20 years and fathered a daughter with another woman. This was after he screwed his way through a lot of other women and broke their hearts in his late-teens, early-twenties.
Ontop of this he cheated on BOTH of those women for at least a year with my stepmom, whom he was living with well before he and my mother actually divorced and has been with for close to twelve years now.

Ontop of THIS: He's cheated on my stepmom at least once, I know this for a fact.
Plus he dated her friend for a short period while they were separated and they were only separated for like 3-4 months.

My brother has also fucked probably north of 50 women over the course of his years through the Greater Sudbury, Toronto, Thompson and Winnipeg areas and even now where he's married to his fiance (who was a virgin when they met) he revealed to me once that he in fact cheated on her.

Imagine people's shock when they hear this and then I tell them I'm a virgin still at 24 waiting for the right woman and still have my purity ring (no, not marriage or religion, just personal integrity). My faithfulness and loyalty to my woman extends when she's not yet in my life. Even if she's not faithful to me the same way, I'll deal with that when it comes. At least she'll know how to suck a dick :P.

Also...I'm just scared of people physically touching me.
No one has ever wanted to touch me ever.
Which is funny because my brother is somewhat of a fat guy and during the course of the pandemic I kicked my drug addiction and started working out and I'm ripped now.