I'm sad because I feel insecure and I always feel like my family is just waiting for me to mess up. lt makes me feel so stupid. How do I stand this?

Your family wishes you the best. They wish that you become good, clever, responsible. They can go too far in their good intentions. If you can talk to them about how you feel, let's do it. If you can't you best to distract yourself from your thoughts and do the best you can and accept if you can't satisfy them fully (and even if they resent you for it).

Everybody has their insecurities and it's perfectly all right. Just don't let them get in way of your life and don't let them dictate you, what you can or cannot do. I sincerely hope your family doesn't want you to mess up and If yes, they should feel ashamed. I believe there is someone around you who can support you, try talking to them. You are not stupid, don't let anyone tell you otherwise. If you're comfortable, try to talk to your family about it. Start with someone who is close to you and who you trust. Maybe it's all just because of some communication barrier.