Hi Sharon,
This is Li Xia. I learned from your post that you want to improve your Mandarin. I think I'm suitable for you. I'm a Chinese high school student, I wish I can help you with your Mandarin and make friends. Also, you can help me with my English. To improve your Mandarin, I have two advice for you.
First, you should do more practice. As a saying goes, practice makes perfect. We can chat in Chinese on WeChat. It's both convenient and cheap. Second, watch some Chinese programs on the Internet. They are fun to watch and can do good to your verbal Mandarin at the same time.
As for my English studying, I wish to be your pen pal. It's a great fun for me to write to someone who lives in the distance! We write in English, this can help my written English.
Looking for your reply.
Li Xia