Any moment you spend anxiously worrying about what you are going to text them is a moment you are not having fun. Have fun.
Instead of anxiously pouring over messages realize that life is short and there are lots of people out there. If they don’t want to date you because you texted too quickly or sounded too desperate or because you weren’t perfectly witty, someone else will. Have fun. Meet lots of people. Someone will like you.
Overanalyzing your text messages will not do much for your attractiveness in the grand scheme of things, but it will make you anxious right now. It will feel bad right now. So stop.