Plan to not talk too much but listen attentively. Then you won't have that much of a chance of saying something stupid, plus, people usually appreciate when you listen to them with attention.

That you do not text him excessively is cool. Great job!

Worrying about these things may mess everything up (may - not will, but may) and, for sure, is a waste of your time.

If he does not like you, you will deal with his not liking you when his not liking you manifests itself in some tangible way. Trying to deal with the possibility of his not liking you ahead of time is fruitless.

When you plan to get married, you should think in advance of what would happen if he stops liking you. This is because it would be consequential. So you should assess how litigious your possible mate appears to be, before marrying. The consequences of having a litigious soon-to-be ex spouse are severe. And there are many other bad things that can happen when a marriage is being dissolved (as 50% of them are). So you need to think about what would happen if you stop liking him, if he stops liking you, if you both stop liking each other, etc. That is not a waste of time to think of those things. It is actually quite rational.

When all that you have had is one date, his not liking you would not have severe consequences. You would be disappointed, perhaps, but you can deal with this disappointment when the time comes for it. There is nothing to plan or prepare for in advance.

So your attitude should be that of WHATEVER.

If he likes you, great. Whatever.

If he does not like you, that is not the end of the world. Whatever.

This attitude should help you more than trying to boost your self esteem would.

The WHATEVER attitude has many collateral benefits:

1) you would not be nervous
2) you would not be compelled to text much (you are already not texting much, which is great, but, just to mention, as an added benefit)
3) you would not be worried