Maybe it's not because you're too simple-minded. Picasso was told he was too abstract; Einstein was thought to be crazy. Who is to say your "simple-mindedness" isn't the next big thing? If there's one thing for sure, that's that you're not the same as others... You're not lazy, and you're not stupid; don't ever let failures and defeats, or even society, tell you otherwise.
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But I know, I know that you're really tired and exhausted. I know you've tried. We don't know your limits. But if you decide that you have had enough, just know that I'll always be with you, standing by your side (even if not physically), no matter which way you choose to go...
Talk to people about it, your teacher; your peers; your mentors; someone that can help.
Talk to me...
Run to me.
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No problem is too small between us.