Okay, I'm going to go out on a limb here and jump to a conclusion.
This is my guess: That Shira got bad grades in school, didn't get into college while his or her friends did, regrets it and wants to share the life lesson with an audience. An admirable goal.
What you need now is a compelling story to communicate your theme to an audience. Sometimes what is dramatic to us in real life - is not dramatic or interesting to an audience. No offense, but the little bit you've posted doesn't not sound all that interesting to watch, although your theme is solid. Seeing a character find it hard to focus on their studies is not must see TV
Perhaps the story is in the high school experience the first time around, rather than having the protagonist go back to school. Or the struggles they face trying to make their way in the world without a college education. Your story should lead your character to an epiphany, not start after they've already had it.
Perhaps there is a better way to communicate your theme that has nothing at all to do with high school.
While it is true that it is good to write what you know, it is not always best (especially for new writers) to write a story about a real experience. We are often emotionally connected to the experience and do not have the objectivity to separate what will work dramatically on screen from what actually happened. Sometimes it's best to go with a totally fictional story. There are far more powerful scenarios to dramatize the consequences for a character who ignores what he knows is right.
I could be totally off-base here, and this might not be based on your real experiences - but either way, your main goal should be to find the most powerful story to communicate your theme.
Also while it is important to know the backstory of your character, it serves no purpose for you to post it here. The background of your characters is for your reference as a writer only - as it helps you define who they are, what drives them and how they will react to the different conflicts in your script.
Whether people on this board like or don't like your character does not matter. The only thing that matters is that YOU know your character inside and out and that you are not afraid to give your characters flaws.