"Never Really Considered Myself...." --Common App Short Answer

I never really considered myself to be quite the athlete, after years of dropped basketballs and tripping up in soccer I probably should've called it quits. Probably, but I didn't. Last year I joined our school's girl volleyball team, still searching for my niche and ready to try new things I came to tryouts. Making the team was just hurtle number one in a season filled with hard practices and game bench warming. New teammates were judgmental, and I had to learn to cope. But that challenge was one that helped strengthen my character. I didn't instantly become a volleyball star but I can definitely say all the work and initiative I put into it paid off. It's now my second year on the team with familiar (and now friendly) faces, and instead of warming the bench I heat up the court, starting every game as middle blocker.

What do you guys think, please leave any feedback good or bad!

It's pretty good. There are some grammatical errors:
"Probably, but I didn't"
"Last year I joined our school's girl volleyball team, still searching for my niche and ready to try new things I came to tryouts."

The first sentence incomplete. The first half of the sentence should have a subject and verb.
I should have quit, but I didn't.

The second sentence can be fixed in multiple ways. Being a run on, the sentence would probably work better divided into two. I understand where you are trying to go with the sentence, but too many words can be a distraction.

Last Year I joined our school's girl volleyball team. I was searching for my niche and ready to try new things.
If you maintain the same verb tense through both sentences, it might be more appealing.
Last year I joined our school's girl volleyball team. I was compelled to continue my search, thus compelling me to attend tryouts.

You know what... ignore the last one. If you've ever taken advanced foreign languages, then you'll understand how confusing verb tenses are. There is conversational, perfect, and another which I forget. It's the difference between "I did" and "I have done".

Overall, it reads well. It conveys your enjoyment of the sport. I would only recommend that you look over it and briefly address any grammatical errors that you might find. Try reading it. That will make it easier to catch mistakes.

Run on sentence:
I never really considered myself to be quite the athlete; after years of dropped basketballs and tripping up in soccer I probably should've called it quits.----> I fixed it with a semi-colon.

Also, it is stylistically nice to keep things "parallel." like this: ... after years of dropping basketballs and tripping up in soccer, I probably should've called it quits.

Seems like a sentence is missing from the end. At the end, give the moral of the story! :-)