im 13, should i take caffeine pills?

You are an idiot.   Just take a multivitamin and see if that helps.   And learn how to post in the correct category as well.

You should stay away from such pills at all costs. 

Try getting more sleep and going to bed at a proper hour. 

You should eat right, stay properly hydrated, and get plenty of rest. That'll help with energy issues.

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Your question belongs in Health>Diet & Fitness or General Health>Other-General Health as it's currently in Yahoo Products>Yahoo Answers and not applicable to this subcategory (and thus decreases your chances of getting many useful answers).

Moving your question can be done by clicking Edit (pencil icon for mobile)>Edit category just beneath your question, then selecting the category that's appropriate for the topic.

Just drink coffee. And if you don’t like coffee. Drink 2 or 3 full cups and you’ll get used to the taste and learn to like it.

Don't take it, but let them do it to you.