didn't have any challenge in my life
If you had no challenge, then you had nothing that was important to you. Let's get fired up, now, and dig deep. You are capable of writing something excellent.
even a mayonnaise jar you're having trouble opening, or your favorite video game...there is no such thing as an inapplicable topic
I don't know if I agree. I would advise against writing about a mayonnaise jar or video game.
Actually, I think the best thing to do is use this as an opportunity to write about something related to your field of interest.
If you have no field of interest yet, be creative. Choose a field of interest tentatively. Even if you do not plan to declare a major, you can write about a career that interests you.
The way to do that here is to write about a challenge that inspired you toward a particular career. If you were mistreated, maybe you are interested in social work. If you were wronged in a legal sense, maybe you are interested in law. If you experienced the illness or death of a loved one, maybe you feel motivated toward health care.
See, the thing is, just having passion for a subject can be a source of a challenge. It also can be associated with memories of experiences.
The problem is that you were not inspired yet, so you felt like this was impossible, but when you have lots of energy and creativity, you will be able to know with certainty what is important to you.