Elizabeth Banks will try all sorts of things in an effort to keep her skin looking good, from tweaking skin care routine to her diet. But the one thing she still hasn't tried? Injectables.

"I've never put a needle in my face," she tells PEOPLE. "And by the way, most people do it and truly, there's no judgement," the actress, 49, adds. "But I make my living with my face. And basically I'm terrified of f---ing it up."

Banks, who's now the first ever celebrity ambassador for the beauty brand No7, goes on to say her beauty routine is actually lot more than skin-deep.

"It's a mental thing too," she says. "When I start thinking about messing with my face, it's because my self-esteem is a little lower, and that's usually because I'm not taking care of myself."

She continues, "When I'm exercising and eating well and feeling good about myself, and am confident, like 'Did I make a good decision today? Did I mom the s--t out of my kids today?' That's when I think I look and feel amazing."

Banks says she loves the accessible aspect of No7. "I really have always used drugstore products, to be honest," she says. "Whenever I had the $350 cream, I'd be like, 'Okay, just a little around the eyes — don't waste it.' But then you realize I need more moisture." That's where this brand comes in. "You don't have to use it sparingly, it's not breaking the bank."

Her first introduction to the brand was it's retinol. Now she's loving its peptide line.

Of course, she admits she's had some thoughts on the aging process — but has no issue with turning 50 next February.

"I've been thinking about it as the midpoint," she says. "And I just can't believe I get a whole second life after this. Isn't that crazy? And the first half of my life was having to learn everything and make money and put a foundation underneath me. Now I have all that, and this knowledge base, and so I really feel more powerful than I've ever felt before."

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She jokes that turning 40 was way worse.

"I literally felt men look at me and be like, 'Oh, you can't make me a baby anymore. I don't need you. It felt primal, like suddenly I wasn't a sexual being anymore, and in a way that rocked me. Which, by the way, of course I was already married for years at this point. But now I'm like, whatever — no one's trying to have sex with me. And who cares? I let that go long ago.

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