Getting a paid internship while going to school can be difficult. As a current student myself, I've seen that applying to as many internships as possible will increase your chances of getting a few responses or interview opportunities. Another useful tip is to leverage your network - ask upperclassmen or people around you particularly in the industry field you're looking to work in. They may know someone in a company looking for an intern or know of an opening in their own network as well.
Participating in extracurricular activities can also be beneficial in showing your interviewers your best qualities through experiences you may have had that can display leadership, problem-solving skills, or your passions. They can also differentiate you from your peers and increase your chances of landing the job. Good luck!