[akulbe]

Every "Senior" started out as a "Junior" at some point. Try not to get hung up on this.

I have two pieces of advice for you, as someone who has struggled with these very things:

First, don't compare yourself with someone else. You are only competing with yourself in the end. The person you're comparing yourself to very likely could have the same doubts as you.

Second, just start. Don't get stuck in analysis paralysis, and only think things to death. I'm happy to share my experiences with you. My email is in my profile.