My parents underestimate me everytime?

My parents underestimate me everytime I want to try something that I will fail and they will eat me alive. It annoying that they think like this. 😤
Recently (aka yesterday) I went to the Biology olympics, without learning and taking afterclasses (here if you don't take afterclasses you have 0 chance of achieving a good score) it turns out I needed just 2 more points to qualify for the country level. But my parents were all like I shouldn't go because they will eat me alive and blah blah blah. This isn't the first time they behaved like this...
Why are they like this and what can I do to make them realize I can actually do something?
My parents underestimate me everytime?
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