I’m worried about sex with my new girlfriend

She’s in her late 20s and I feel she’s probably expecting experience and mind-blowing sex — but my marriage was sexless towards the end and I feel very out of practice.
It is great that you have met someone new. People counsel against rebound relationships but as long as you don’t rush into serious commitment, the distraction of a new partner is the most effective way of distancing yourself from your divorce.