presumably, you really wanted to be an engineer AND you interviewed at a few places and got the job you wanted. few people are lucky enough to do what they want in life, and fewer still have the privilege of making things. you do. be excited.
appreciate that you get to be around people who are as excited about software engineering as you are. ask people about what they're working on. learn from them. if there's an opportunity to propose a good idea, do so. accept the feedback you get if you find that your idea wasn't perfect, but don't give up. keep in mind that you work in the software industry and not the mafia: you're not being paid for your silence, you're being paid for your ideas.
read every single line of code you can get your hands on. learn the system inside and out. be ready to pitch in and work on code you're responsible for.
i've been coding professionally for a while. everyday i get to collaborate with colleagues who are dedicated to making great software. i've learned so much from them, and i've been given many opportunities to contribute across the project i work on.
be kind to your colleagues: the industry is small, and you're going to be working with these people for years even as you switch companies. the colleagues you get along well with will help you find work when it's time for you to change jobs. that said, don't be a pushover either.
in short: play well with others, speak up, be curious, and do well.