How do I stop feeling bad about my college course?

I picked the course I love and passionate about but I always feel bad that I got it easier because of how my friends boast how much they struggle with theirs. At first, I really felt sympathetic because, as they say, they can't even sleep and have a lot of projects to do but it got old. "Are you guys free this day?"-> " There's no free time in *their course*" or "your course have a lot of free time" or "at least you don't have to do any projects"or "lucky for you, you don't to struggle with anything". I would, sometimes say my struggles but they'd reply with how their course is harder. Is it just my pride? Or am I getting tired of being invalidated? I do have really low self esteem and I feel bad just thinking&writing this.