Double-texting someone you like? It's really not that deep.
I've done it. Sent a message, waited, got anxious, and sent another one. Every time I felt this wave of embarrassment like "why did I do that." But then the person replied normally and literally nothing happened.
The whole "double-texting is cringe" thing is just a weird social rule someone made up. Real people get busy. They forget. They see your message and think "I'll reply later" and then don't.
If you like someone, text them. Twice if you want. The right person won't count your messages — they'll just be happy you reached out.