Help correct my sentence please!

<p>"Even when I am sitting down, it seems like I could never sit still for more than five minutes, occasionally I would have to shift my legs or my body position. "
And the sentences afterwards to give some context:
"I’m a restless person who wants to make the most of her time; this is just a part of who I am. Which is one of the reasons why I started volunteering at Marshall Elementary School on Wednesdays after school. "</p>

<p>This is the first sentence in my essay and I don't think it sounds right but I'm not quite sure how to rephrase it.</p>

<p>What is the essay for and what are you supposed to be writing about?</p>

<p>Being restless and having to shift body position doesn’t seem to have a lot to do with making the most of your time or necessarily a good reason to volunteer at an elementary school. Are you writing about being restless or leading into your volunteer work?</p>

<p>You are right. That first sentence is a mess. Divide it into two sentences and keep your tenses the same. And don’t repeat the word sit/sitting. Better yet, throw it out and be more illustrative by creating a picture for us of a specific example or time when this happened to you.</p>