Any errors?

Hi, I'm going to present myself.
First of all, my name is Sol and I am 15 years old (yes I'm very young). I want to learn how to speak and write English well, so if you are reading, help me! That would be awesome!
If you want to talk with me, you must have an above intermediate level, ok?

Thank you!

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Hi Sol.  I think that you didn't need to write "but" before "I want to learn...".

Error!?

Hi I'm (uppercase or big 'I' when talking about yourself) going to talk about me.
First of all my name is Sol I am 15 years old (yes i'm so young) but I want to learn to speak and write English well if you(that are reading) could help me. This is going to be awesome!
If you want to talk with me you must have more than a intermediate level,yes?
Thank you!!

Your English is pretty good already! I went through and changed all of your little 'i's to big 'I'. 'I' is always big (uppercase) in English when you are talking about yourself. Ex. I went to the store so I could get some bread. Sometimes on Facebook or other online forums people get lazy and use the lowercase 'i', but it is incorrect.

I switched 'English' and 'well', which is pretty standard word order for English. Ex. 'I ran home fast.' NOT 'I ran fast home.'

You can say, 'I am young' or 'I am a child', but you cannot say, 'I am child.'

Other than that, excellent job!