It's our abilities to deal with obstacles and hard things setbacks and much more in our lifes.
Also in some point the LEVEL OF HARD or EASY wich we choose knowingly or quite accidently.

Take your problems and compare with other people yours you will find that many people would be HAPPY If they only could have problems what you have.
If you struggle and not doing well it means this problems and issues are for you to grow and learn because If you start talk with other people who got more hopeless situation then yours then you find out that WOW my problem is really not that big and i can find the solution.

In many case they say GOD and life is fair and you get only problems what are exacly for your level in mentally physically by your prepared conditions.

Now If you compare yourself- with someone who lives in bad countries goverment are corrupted violance no resources and daily life is huge struggle, and you live in let's say in eu usa or any other democratic western society and you feel like you struggling and you poor, then someone else who don't even live in this country where you will that he or she will be happy If they would be you with your problems and opportunities.

If you see anyone who got way harder struggles than you have then it's because they are strong enough to carry them but If those struggles will come to you then it will be too hard for you to deal with them.