Sexual health help needed

Hello, I’m a man in his late 20s and I am moderately fit in nature.

But I am not able to get hard at all when I’m in bed with my wife (I think it’s got to do with self confidence and pressure). I guess I have penile erectile dysfunction.

I would love to get some help regarding how can I solve this. It’s not like I want free advice, if anyone can guide me to a doctor I can schedule an online appointment with them.