Otherwise it sound like you are making a statement.

Someone can help me. (statement)

Can someone help me.(question)

Hello everyone

Hello everyone, my name is Javier and my native language is Spanish, I want to improve my English, someone can help me.?

Hola a todos, mi nombre es Javier y mi idioma nativo es el español, quiero mejorar mi ingles, alguien me puede ayudar.?

Here is a quick tip

When asking a question put "can" way up front.

Can someone help me?

That also goes for other iterrogatives like "What, when, how and where"

Where are you going?

What is that you are holding?

How is everyone today?

Where is my wallet?