How to make myself and other’s positive affirmation’s stick with me?

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So as the title suggests… how do I make these stick? Like there are a lot of good qualities for me to be confident and feel good but its really hard to get them to stick.

For example, I was told by a few good friends that I am more confident than I think i am and also the qualities they like about me. However, it felt good for a little after but now after a few days it feels as if it didn’t happen. Or I tell myself, “you’re worth it, you’re an amazing guy” etc.

I keep trying to remind myself of these and I know these qualities but how do I make these stick with me and legitimately “feel” those attributes. Maybe I don’t trust it/believe myself as much?

Hopefully this made sense, thoughts?