i know a guy who jokes around 24/7 and acts like a total fool non-stop, nonetheless he look more mature than many people who are serious all the time... how can you be so mature, when you act like a clown 24/7?
You asked her if she wanted to grab coffee. Then you asked if the time worked. Then you asked if the place was okay. Then you asked if she'd prefer tea.
Four questions. Four chances for her to say no. Four signals that you're terrified of making a decision.
Plan it. Pick the place. Pick the time. Tell her where to meet you. She'll either show up or she won't.
Either way, you look like a man instead of a scared little boy.