Sex is as much about confidence as it is about other things. You have to be confident to lead, and you also need to be confident enough to be lead, otherwise it can get clumsy and awkward.
In a new relationship, it is absolutely normal to be nervous, but down the line it is important to work on your sexual confidence.
To do so, you can work on your mindset and how you dress. Learning more about what your partner likes can help. Don’t be afraid to ask naughty relationship questions for guiding answers.