I always feel that I am too useless, and I have to do a summer job, too afraid that I can't hold on and be laughed at by others;

Even if I feel useless, what can I do? Be confident! After all, not everyone knows the world. Now that you say you can't persist, it proves that you know you can't persist. Then who will help you if you don't work hard? This kind of thing needs honing. Not everyone is born. In order to survive, you must also step into the society. After all, it is difficult to take every step to gain a foothold.