How to give a good first impression?

So in a few weeks back to school will roll around and I will be returning to college for my third year. Everyone I know will be off to university and I'll be in new classes with new faces. I want to make the best first impression I can and kind of reinvent myself to be more 'me' than I have been in the past. In the first year of college I was really quiet and didn't speak to anyone. Then in the second year I was still quiet but I talked to the people next to me and became comfortable speaking to them. This year I want to actually make friends and whilst I know I can't shake my naturally reserved personality I can work on body language and not looking miserable all the time. What is the best way to make a good impression on my classmates and to make friends? Thank you.

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