You're doing fine. It's perfectly normal to feel nervous once qualified and you're absolutely right to make progress slowly and in stages that are comfortable for you. As you gain experience, so your confidence will grow, but beware of over confidence as well.
When I qualified back in 1971 I felt very uncomfortable about leaving the local flying area and it took a long time to gain the confidence to start cross country flying. I think I had over a 100 hours before I felt that attempting a cross country to somewhere I'd never been was normal. Even now, fifty four years later I work on doing as much preparation as possible. Even using a home sim to fly the trip first.
Also, be aware of outside pressure from social media or those who will tell you that only by stretching your boundaries will you learn. Ignore them and do what brings you pleasure. Just because someone on youtube or facebook with half your flying time is wandering across Europe having a wonderful time it does not mean it's right for you. Social media will put you under pressure to equal the deeds of those you perceive to be your peers. Ignore them all, especially the ones who've bought a gopro and elected themselves to be 'educational influencers'. A lot of the information and airmanship they demonstrate is nothing less than dangerous.
Go flying. Enjoy your hobby and don't set yourself any tasks that you are not happy to undertake unsupervised.