WTF is this hypocrisy

So the title is vague enough . Let me give you all some background, Went on a date a couple weeks back. Before that everything was good ( I assume) and the date was awesome too (that’s also I assume). But just after that somehow things started to cool down. Longer time to get a text back that in turn , made me into a person who’s normally lame , but to a bearable extent to a person who does not sense into anything he says in an attempt to save things. People say looks don’t matter person has to be courteous funny etc etc but at the end this always happens with me ?! Which in turn leads me to the point of self blame , self pity and all things bad. And I genuinely assume it’s due to my looks and I’m a good guy (too good to be true they say) How do I change myself ? I’m tired of this hypocrisy that you have to be nice to be with someone. Any experiences and help is highly appreciated :-)