I am glad to see your dedication towards your work and this project.
I would suggest you to explore first that are you percieved as a novice by other members or is this thought stemming out of your own insecurity?
It often happens that we start doubting our capabilties/ performance levels, if surrounded by more experienced or qualified lot.
Since you are part of the team, we can safely assume that one or more person in the team feels you are qualified/ capable enough to be part of that group.
Hence, if you are working hard on this project, it will be shown through your work.
You simply need to work on building up you self confidence and trust in your abilties. Once you are sure about your calibre, you will find it easy to convey your ideas and thoughts.
If you feel you lack the knowledge to be able to project your opinions/ ideas, you can always work harder on building that up, by reading, researching etc.
But if you feel you have ideas, opinions, knowledge to share, but still feel any kind of hinderance, you surely need to work on building up a confidence in yourself. You will have to believe in yourself and your work.
Remember, once you feel confident in yourself and stop doubting your abilties, it will reflect outside and others will automatically start percieving you more seriously.
Keep that motivation up.
And use your inner strength to achieve all that you want.
Wishing you more success