Everyone makes mistakes and most people are nervous for big changes like starting a job. That's okay. Reasonable companies don't expect recent graduates to know everything or be as productive as seniors.
It's great that you are learning new things. That's most of what you can do to succeed: study well, be curious and interested, and maybe some soft skills.
If you're doing that, try to not lose any sleep over it. You're doing well, perhaps better than many others. You'll enjoy it much more, and thus keep motivated, if you're not doing it out of fear.
P.s.: don't miss out on depth by frantically looking into every technology. You don't need to know every technology. Get somewhat competent at whatever you like before trying more.