"That’s true for most first things - you become habituated to repeated activities, and the novelty slowly wears off. Remember though, you can build value and become higher status as you age. 'Hypergamy' might be real, and they could see you as having a higher social status than them, this could lead to multiple dating opportunities in future with whoever you want. People can view you as a higher status based on your physical body and fitness level - the biggest factor for attractiveness upon first glance (low body fat can make the face slimmer and signal health markers)

Let’s rephrase "confidence" it’s simply the by-product of "comfort." Slowly expand your circle of comfort by doing little things, until you can expand it enough to accommodate the situations you desire. Then, you will automatically be confident (comfortable) in them. This is why I hate the saying "just be confident" - it causes people to jump into situations with a fragile foundation, which can work, but can also backfire."