Are you that shy and unnoticeable or are your group members just a bunch of dicks?

On the contrary, best group members ever. They do the work, you get nap time.

Unless this is a high school project and they tell the teacher OP didn't help.
College professors usually don't care.

on the contrary. college professors do care however they give the group the power to kick your members out if they don't do their job.
I've kicked out 2 people from my 3 person group because they never responded and didn't turn in their parts on time. they had to do an entire project alone overnight.
I also removed someone from a PowerPoint project because he talked on his phone in the hallway for the entire project then comes back in and goes why isn't my name on the PowerPoint?
teacher both times goes, well maybe you'll participate next time.
they care but they aren't going to hold your hand

This was basically me my Freshman and Sophomore year of high school. Except they didn't give ideas, they just wanted to use mine.

lol i prefer doin all the work meself. i learned hard way why.

#53 - You want it done right, you got to do it yourself.

Best case scenario: this is your superhero origin story, and you have not yet learned to control your invisibility.

Or, super villain.
Remember, (movie) Electro started off being ignored.

your group members seem to be stupid dicks but why didn't you speak up?

Should have spoken up then, make people hear you aha :)

As someone who is often in that exact same situation, I feel your pain

ask for another group or work by yourself

Could be tough if you're shy, but things would be much less awkward if you just speak up once in a while :)

This happens to me when I try to talk but I think it's because I'm quiet so everyone just talks over me

You are a leader by nature. Listen more and talk less.

OP you gotta be more assertive and put your foot down. Whether those snobs acknowledged you or not, your grade matters. Hope you were able to put them in their place or at least explain the situation to the teacher.