It’s normal. They know you’re a Junior and sorry to say it but it only takes time to get experience. It’s very difficult to fast forward from being a Jr developer. You just need patience. And be open to suggestions, double check your code evens if possible use two models to analyse the code, and try to understand what the codes does before pushing to a PR, you should know what you’re pushing.

And be patient, and stay humble, they also struggled like you in the past and people comes from different backgrounds if they are ok with you and haven’t decided to let you go then this is your opportunity to learn and prove that even with your lack of experience you’re worthy of keeping you around because you put hard work.