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Welcome to the TAC community!
I have to agree that the C chord gives many people problems initially. You didn’t mention exactly what you’re having difficulty with. If I had to guess it would be that your ring finger is interfering with you playing a clean D string. That is usually the issue most have. First, make sure your wrist is pushed as far forward as it can to cause your fingers to go into an automatic arc and force the fingers to play on the tip of your fingers. Next, place your fingers as you normally would. Play each string individually. Which string is muted? Look at your fingers to see how they are placed. Is your ring finger slightly touching the D string, thus muting it. There’s an easy fix. The low E (6th string or string at the top of the neck) is not in the C chord. That is why you strum from the A string. So, it’s okay to move your ring finger up towards the low E. In fact, you can cover part of it. Now try playing each string individually again. Did that clear up the problem?
If it’s a different issue, just let us know. There’s always someone that can answer a question or help with something. You can also take a photo of your hand and send that to be looked at.