Is it normal for my younger brother to be obsessed with wanting a girlfriend?

He's been pushy on the topic of wanting a girlfriend. He just turned 21 (he's 15 years my junior) and has never been on a date.

Flashback: 3 years ago, his male cousin and some other guy offered him the opportunity of doing it with a hooker but he opted out on the last moment and never showed up. He was initially eager to go with the plan but suddenly got depressed. He couldn't handle not being able to get a girl the natural way. He didn't want to pay for sex.

Is it normal for my younger brother to be obsessed with wanting a girlfriend?
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