When I started first business 24 years I had a hard time with getting rejected by prospective clients. I knew I had a good product and service, knew they needed what I had to offer, and they had the money to pay for it... but I couldn't close the deal. This does impact your confidence... until you get to the point where you own the fact that it's a numbers game... you have to get through the no's until you get a yes. I then adopted an attitude that rejection is just part of the process. "I'll meet with 4 prospective clients, one will say yes the other 3 will say no. Getting through the no's as fast as possible is par for the course."
Once I got to this point it was easy, you just thank the rejections for their time, leave my card, and tell them to let me know if we can work together in the future. Sometime they come back (but this is a small percentage).
Anyone that lets rejection get to them will end up in horrible situations that don't work for them. I'm going to name drop... back in 2000 I submitted a proposal for some work with Donald Trump, it would have been a NICE project and could have carried my company for a couple of years. I worked hard on that proposal and got the bid down as low as I could, with still having an 5% profit margin... which was as low as I would EVER go on anything. I had a meeting with 'The Donald' at Mar-a-Largo (I was living in Orlando at the time so it was not a hard trip to make). Long story short, he tried to under-cut my pricing and asked for increased quality. His pitch was that I could use the fact I was working with him to increase my profile and get more customers. I passed... told him he had my best price to guarantee quality and success and I could not go lower. I thanked him for his time and walked away.... never heard from him again, but back in 2008 I had an opportunity to again work with the Trump organization (though not directly for Trump himself), with similar results. Any of the companies that I knew took the work I declined ended up having trouble.
I do not want this to be a political discussion, because frankly I do not blame Trump for doing what he does... pushing for price cuts... demanding quality... I do not have ANY sympathy for businesses that entered into these cr@ppy business arrangements, agreeing to something they can not maintain. If you take a 20% price cut while promising to deliver the same quality, you should not be shocked when your client refuses to pay you when you don't deliver.
The hot chick is like Don Trump... they are both demanding, and they expect you to bend over backwards to make them happy at your expense. If you are afraid of rejection, and only take what falls in your lap these are the kinds of situations you will find yourself in.
Dating is like sales... ignore all the PUA and relationship coach BS, it's a numbers game... and you have to move through the no's as fast as possible to get to the yes... you WILL have more no's than yes's IF YOU HAVE HIGH STANDARDS for how you are willing to be treated. Just get used to it.
Not sure if this helps the OP, and I do not have any advice on exactly how to do this other then learn to love rejection... because that is part of the process.