Hello
 I am Neha. I am 16 years old .I can be your partner if you want.
But I only know how to speak Hindi and English.

Hello

My name is Cat, but most people call me is Sandy. I'm from Vietnamvietnamese. I'm 21 years old (1998). I want to search for some friends to practice English with everyday.

Hi, every one everyone

Hello (you don't need to repeat this, 'Hi' in the above opening is enough)

My name is Cat, but most people call me is Sandy. I'm from vietnamese Vietnam. I'm 21 years old (1998). I want to search look for/find some friends to practice English with everyday every day*.

everyday = adjective ~ everyday clothing
every day = adjective + noun ~ I practice English every day. / Every day I got to work.