how to be more confidence!

I start learning coding before 2 years ago and start working as backend developer since 10 months. I start learning javascript and when started my career I got introduced to AWS, terraform…, before that i have never heard anything about them.
now i feel disappointed most of the time because it’s really hard to me to follow other team members. Sometimes they asking me about my opinion about some stuff and i really don’t know what to say. I like what I’m doing and i working so hard to learn, but some times i feel that i will lose the job which i like and also so afried to of losing the salary. Is there any advice or have any one experienced this feeling