In some ways you are very lucky because your experience of high school, hobbies and life experience will already be different from many UK/ home students so you should take advantage of this in your personal statement. But you also need to make 2 things very clear. Firstly, why do you want to study in the UK and secondly, you need to show that your English is of a good standard (usually IELTS 6ǌ or above). It is no good having IELTS 6Ǒ if you personal statement is full of grammar and spelling mistakes. But DO NOT pay for someone to write your personal statement for you on one of the many websites offering this service. If you have IELTS 6Ǒ, you do not have perfect native speaker style English and universities may reject your application if they suspect it is not your writing.
6. REVISE, REVISE, REVISE. Have another person (several persons) critique your work. Use fellow students, trusted professors, your parents or significant other _ anyone who will read your statement closely and give you constructive advice. You, yourself, should read your statement out loud; the ear will hear errors (sentence fragments, grammatical missteps) the eye misses. Be aware of unconscious mistakes, like starting every sentence with the work "I", using cliches (example: saying you want to be a doctor to "help people"), or over_stating or exaggerating accomplishments or emotions. Once satisfied, put the statement down, do not over_write it and drain it of all intensity and enthusiasm. Lastly, think on this. Your personal statement is your opportunity to tell your "story" and a window into your humanity _ ultimately, that is what makes it engaging and memorable to the schools you are applying to.