Advice please

Okay, I need help. I recently started dating a guy that I’ve been friends with for almost ten years. He’s a total sweetheart and we have an amazing connection. But.. he’s brutally honest (which I really appreciate) but I’m also super insecure and sensitive. He’s very sexually experienced, and I am very not.

So we were talking and he told me that I’m not very good with my mouth. Like at all.. I had a suspicion that I haven’t been sexually pleasing him, but now it’s confirmed. And I feel really bad about myself. I’ve been super nervous, because I don’t want him to be disappointed with the things I do for him. But I haven’t even been able to make him cum with a blowjob, and it’s been months. If you have any advice I’d realllllllllllllly appreciate it. I just feel super bad and inadequate. And I want to get better.