My friends constantly invite me out to places (at least twice a week), but I would rather bring my work home and stay ahead of all my responsibilities. How do I manage to balance a social life with my job?

Ultimately, you should never compromise on what's important to you. If you thrive off of your work schedule, that's completely fine. Some people just prefer to concentrate on their job and catch up with friends when they're absolutely certain that they're finished with all their big projects. When it comes to your friends, gently but clearly state your boundaries. Let them know that hanging out twice a week isn't in the cards for you. Explain that you have deadlines or tasks that you're concerned about. Then, offer an alternative: reassure them that you can still spend time with them. Maybe you can spend quality time with your social circle once a month or even once a week, depending on your unique needs.