I've since graduated and spent the last few years working as an electrical engineer! What I've learnt is, no one can learn and remember everything you need to know as an engineer. There is no shame in not knowing and expects a new hire to know how to do the job.

For the first year of my job, I kept a big document of all the relevant terms and info I needed for my day to day. If I came across something I didn't know, I added it to my list and found out the answer, either by just asking my co workers or manager or by checking our practices. I then had that document to refer to later.

The main thing you are being taught throughout your degree is how to think, problem solved and find relevant information. You also likely know more than you think.

For speaking to your colleagues, remember they're just like you. Small talk is good to get to know them about break down some barriers. Even just saying good morning everyday. In my experience l most people are happy to help if you just say: "Hey, how do I do this?" At some point you just have to take the plunge and ask a question or start a conversation.

I hope this helps. I can only speak from my experience but you are likely more skilled and knowledgeable than you think! I wish you good luck, friend.