First of all, do not think too much. Worrying about making a mistake can prevent you from saying anything at all. It is better to say the first thing that comes to mind - often it is correct, and even if it is not, it is close enough that the other person can understand. The best way to improve though is immersion in an English speaking country. However, this is not an option for most people. Do not be afraid to ask someone to speak slower if you are having difficulty following them. I also suggest that if you are chatting with someone online you also have text chat open as well - that way if one or the other is unable to communicate a word or idea they can type it, and the other person can go to an online translator or something similar. Also, sometimes you won't be able to think of the exact word you are looking for in English. Work around it! Find a description close enough that the person can figure out what you are trying to say. Good luck with your studies.

Be happy about a topic and talk normally. I know im alway happy qhwn i talk about seeing new people and seeing new places.

Be confident

hmmm cant help ya out... i dont chat online that often... if you live in hangzhou id wouldnt mind having a chat while walking around west lake or something and helping you out... otherwise just keep trying... maybe study a small topic and try to get someone to talk about it haha

come on,chat with me .i think i can hele you if you are not sick of tardiness.actually i am man poor english like you.we can study together slowly.