What’s the hardest part of being a single mom

So I’m a single mom and at first it wasn’t as hard for me to do it by myself , I mean my babies dad is still in the picture but he doesn’t help with anything other seeing her every other weekend . I do everything finally by myself which is hard enough , but not only that how people look at me . I’m 21 years old so I’m a young single mom , so people really expect me to fail . I got accepted into a good school and people are so surprised and always say good for you , but it’s so annoying to me like I know their just saying it bc they think oh you’re a single mom how are you going to do that. That’s just a few things that are difficult for me :

What are the most challenging parts for you other single moms .