[mothered]

I know for sure I can't do phone calls, but I can do live chats. My voice doesn't sound like I'm old enough.

The way you Interpret your own voice, Is not the same as how other's perceive It.

You'll also find that an Intense conversation (SEing with a high volume of requests), overrides one's ability to dedicatedly focus on the nature of the recipient's voice.

Some websites only offer emails and phone calls as a contact option.

It's better than only the one option, particularly an email.

A phone call requires an Instant response- no time to think nor plan ahead. With an email, you can sit there all night and think about the best course of action, hence I recommend novice SE'ers use the email gateway prior to exhausting phone calls/live chat.