There is certainly no need to give up! You do need to figure out what is going wrong for you, though. Maybe you need to take a lighter schedule, or take advantage of tutoring, or figure out what is eating up all your time since you have no ECs. Possibly you need to just train yourself to study every day. Do you procrastinate? Get distracted easily? Are you living in the dorms where studying is more difficult? Figure out your answers to these questions and then make appropriate changes like keeping a schedule, studying at the library, getting a quieter place to live or seeking out tutors or study groups.