Hey, I just got this little curly hair and he built a burrow and pushed all this dirt to the entrance and made a wall sealing himself inside of it. I was just wondering if he did that cause he's going to molt or he just doesn't like me.

It may be because he is in a new place and he is still trying to adjust. Give him some time with minimal interaction. Try to stay out of his tank for a few days as much as possible.

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Curly Haired tarantula's are Burrowers. My Tarantulas burrow constantly wheter they are going to molt or not. nothing to worry about. It's perfectly normal for him to burrow.