I yearn to master English with a longing to die for. But I dread lest my effort fall short. To overcome this fear and be successful, I seek a native English language partner wanting to learn Chinese. We could both benefit from such an exchange.
I suggest that you use more active verbs and fewer participles like "liking", "being", "learning", and "helping". It is not wrong to use participles, but if you used more active verbs your writing and speaking would sound stronger and more decisive. Also, the active verbs that you do use ("die", "look", "wants", "learn") are not very imaginative. Try to expand the number of verbs in your vocabulary.
You don't have to say "English speaker or American". All of us are English speakers. You could say "an English speaker (U.K or American)"
I do not understand your use of "long".
Notice how the use of good expressive verbs: "yearn", "dread", "fall", "overcome", "seek", "benefit" gives force to the paragraph.