something on my mind   

The time goes so fast recently i felt.Unfortunately i am so busy working everyday that don't have time to do what i want at all .Tonight I just felt a little tired on my way home after (i finished my) work  .

Sometimes, when am so busy, i want to quit my job .But on the other hand I am thinking a lot about the experience that i need.

So far i have had to overcome some difficulties that i needed to face . {a native English speaker would say that in a different way. It is difficult to understand what you are referring to. If you give me an example I can give you another suggestion how to express it in English. But the sentence is correct now}

I am excited to practice my English espicially when i meet clients from other countries.

It's necessary for me to have the opportunity to use English to communicate with other people in order to improve my spoken English. (well, that sentence did not sound English but I know what you mean. I feel the same with my Chinese. The language is in some way abstract unless you use it to communicate in real life. Only then it becomes a real language)

Come on( 加油 sounds a bit awkward here. you are saying it to yourself but the rest of the sentence is directed to the readers), i will try to reach my goal as soon as possible . (Change of word order)