Which type of regret is worse? Regret that u didn't try and close the bird, or regret that u tries to but it was unsuccessful?

U need to realise that the former is worse. It's a "u will never know" feeling.
U need to realise that the latter only leads to improvements in your game. By analyzing what went wrong when u made your moves, u can refine the approach in the future similar situations. Thus gradually improve. Plus, u may well get the girl.

secondly, stop looking for prefect woman and perfect situation. Doesn't exist. Abundance. If u fancy her, make it happen. Don't over think. By abundance of woman, u ain't looking for perfect woman u instead want one that u wanna bang and therefore u make a move on her.

If the approach doesn't work out then there will be another woman that u like the look of around the next corner.

Remember U ARE THE MAN, woman also like shagging. With that confident approach, make it happen.