People who are soft-spoken/ speak in feeble voice,how do you all survive in corporate?

In all my internships and now in job, the only negative feedback I have ever gotten is that I speak in such a low voice that they can't hear me so almost everytime I have to repeat myself which is embarrassing tbh

I have started speaking a bit louder but it doesn't come naturally to me and that's something I do if it's in my back of mind but mostly I do get a lot of comments due to my voice, even on calls, I have to repeat.

Anyone who has been in the similar situation, what did you do? did you come as less assertive? I don't want it my voice to impact my growth or look like a pushover