When you do it, then you do it.

“I don’t use it because I am not good it. And because I am not good at it, I don’t use it.”
Can you say the same for your English and communication skills?

It’s like your bike and your body. The more you use it, the better it functions. Put your bike in the garage for 5-6 months, and all sorts of problems start appearing when you try to ride it. Once a person retires from his job, all sorts of diseases start to catch him. (May not be scientifically correct but this is what I have seen)

This is because certain things grow only when they are used. If you run daily, your running strength will improve and you will be able to run more. If you exercise in the gym daily, your capacity to lift weights will keep increasing. If you swim daily, your swimming skills and stamina will continue to grow. 

Same applies to language and communication. Speak more to speak better. Find more opportunities to talk to people. Stop thinking. Start acting.

Speak. Write. Read. Listen.
Don’t just think of doing it. Actually do it because when you do it, then you do it.