All languages have things that are simple and others that are complex. The Roman alphabet is a simple and efficient writing system, but English is not written phonetically, so it is a more complex implementation than, say, Spanish, where sounds are written consistently. Comparing a few aspects of languages and trying to assess their difficulty oversimplifies things. However, yes, you will be able to master English if you try- plenty of Chinese speakers have. We have examples here of Chinese speakers who have reached native speaker level, though the majority don't get that far, but becoming fluent is a reasonable and achievable goal.
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