2. BE POSITIVE. Your statement should not sound staged or stilted, but enthusiastic and motivated. Consider topics which would be easiest for you to put descriptive words to. Your personal statement is a testament of your passions and your earnestness, the image you want the reviewing committee to see of you. That image should never be negative, bland, or boring; you want the committee to say, on reading your statement, we'd like to meet this person. Avoid using "waffle" words (words which qualify your experiences and commitment) such as "rather", "quite", "somewhat", or "probably". Waffle words tend to give the impression the writer is unsure of him or herself; with the personal statement, all writing should be positive and express confidence and directness.
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.