Do you know what these guys are doing? They're building a foundation. If I was a builder or contractor, I would be very anxious with moving forward with a construction project unless I felt confident in how solid my foundation was. The "interior" or "facade" work is real easy. It's the core and shell job that's the most important.
If your feelings are stopping you from approaching a girl, then there's probably a good reason for it - and you should listen to those feelings. If you're feeling afraid, or anxious, or uncomfortable or lost... STOP.
Take a step back. What's going on? Are these feelings and thoughts "rational" or "irrational?" What is your brain trying to tell you? WTF are you doing? Are you really ready for the consequences of your actions? What's going to happen if you get this b*tch pregnant? Are you ready to have kids right now? Are you emotionally ready to jump into the lion's den? Are you able to handle her dose of soft manipulation until she basically gets her way with you, and before you know it, you're paying off a $500k+ mortgage, two tuition bills, and are driving a mini-van? Are you SURE you want to go do this? Where the fuck are you going to go? Your parents' house? Oh, that's fucking sexy. Are you going to be having sex next to your roommates? Wow, big strong important man you are in society... that's going to work wonders for your self-esteem every time you're fucking.
So, if your brain is trying to get you to stop... STOP!
Take a step back and think about it. Is this what's going on? Are these thoughts rational? Am I trying to build a story with a foundation that's not solid?
If so, then you need to work on your foundation. My father's "advice" was to just "jump in" and "test the waters," and "see what happens." I'm not a big fan of that advice. I believe in preparation and "intrinsic" and objective value that's impervious to subjective opinion. When a guy is a stud, he's a fucking stud. Even other guys tip their hats off to him for being strapped, or being a boss socially, or being a kingpin in business.
When you've built a solid foundation for yourself, all that anxiety and thoughts or preoccupation of "desperation" are doing to go away.