How to get over anxiety when texting the guy I like forst?

I am seeing this guy and I always get unbelievably anxious when it comes to texting him first. He is usually the one to text first but I know if I always leave it to him, he will eventually feel like I'm not interested so I'm really trying my best with it. I have social anxiety and texting anyone is an stress-inducing task for me so when it's someone I have a crush on it's even worse lol. I always feel like I'm annoying him or something when I send him a message out of nowhere - what if he suddenly didn't like me since our last conversation a couple days ago???? A lot of thoughts go through my head.

I sent him an Instagram reel almost two hours ago and he still hasn't responded so I'm sitting here trying to be rational and not overthink or regret reaching out lol. Anyone else experience this and have any advice?

You sent him an Instagram reel at 05:45 am and are concerned that he still hasn't responded by 07:40 am. The guy's in bed, asleep!

My post was being approved so it was actually 7:30pm when I sent it lol - still no response now but I guess it's to be expected on a Saturday night/Sunday morning. I just get so anxious waiting for a response and the longer it takes, the more I regret sending a message in the first place since I have time to overthink it

Wait you're together and you get anxiety about texting him first?

We aren't together or exclusive or anything - just talking with the knowledge we are both interested.