The first step is to stop lying to your parents.
Then, you may want to consider what you would like to do, perhaps you lied about these classes because you felt pressure to take them but hated them and didn't want to go on that path.
You are only 20 years old, so there is plenty of time for you to figure out what you want to do, like try different things until you find something that you like.
Ask for support from your parents on this, like some time to figure out what you want to do.
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Drain and plane and grain and blain your brain, and then again,
Propane and butane out of the gas main, your blain shall sustain!