Dating advices

So I met this guy, he's nice and mature, one year younger than me and more into me than I am into him. We had our first date, and it made me so nervous and anxious, that I almost canceled at the last minute...which wouldn't have been nice let's be real.
I want to learn to know him, but just thinking about him and receiving a text from him make me too anxious for what it is... I'm not ready to date I think, do I want to date someone ? How to date someone without feeling like my stomach is torned apart ?

Any advice, anecdote or trick are welcomed ! Thank you !