Undergraduate /
First, and only, child of my devoted parents; World you come from- UC/ PS [2]
Good start and good topic. It's relevant to your major. ...but...
There are too many long sentences. Doesn't fit a short essay like yours. Cut out the fat and wordiness as well as conjunctive grammar. Your opening and closing statements are really hard to read. They're very long and not concise nor flow well at all.
Expand upon the USMC and research a little about it. Their history, creed, mission, vision and an example to use from your exposure to your dad.
Don't list the GPA because they already get that in your application or transcripts. Don't repeat information that is already factual or concrete. Elaborate on it using imagery and description.
Do thousands get diagnosed with life threatening disease each day? Be careful making invalid statements that you don't know. Especially statistics.
You're using a lot of cliches and common phrases. Don't. Be original and diverse.
There are a lot of redundancies too.
Cut out the pork...elaborate more in depth as well as sub topics that are pertinent to this essay....and cut out the pork.
Use original voice in your essay without the cliche and familiar phrases that we all hear.
Grammar. (semicolons and commas...majorly).
Turn all these compound sentences and phrases into one concise sentence without the drawn out verbosity.
Do this and post that one in replacement of this.
Maybe another 5-7 drafts to go.