You are clearly a very strong candidate for a scholarship. What sort of scholarship is it? If it is intended for particular students or for students interested in particular subjects, be sure to highlight the ways that you match the criteria for the award.
Two things stand out for me: (1) Your engagement in a variety of socially and environmentally-conscious causes, and (2) the barriers that you have faced in reaching your educational goals. Of these, the first makes you stand out most, because many people who apply for scholarships have faced barriers. So, my first piece of advice would be to replace your currently somewhat dull first sentence with a sentence that immediately tells the reader that this is a student who is already working for social and environmental justice and who will use this scholarship to move forward with that kind of work. Then go on, as you already do, to identify yourself as Latina/o and talk about your pride in your culture and the difficulties of being the first generation.
(By the way, I notice in that first paragraph that it is unclear whether you are the first generation in the United States or the first generation to pursue higher education -- be sure to specify which.)
On the question of writing, your grammar is generally good but you have a tendency to leave out commas. Commas are the equivalent of pauses in speech. When you leave them out, it makes your words run together as if a person were speaking without taking a breath. I notice that you tend to leave out the comma that should follow an introductory clause: "As my high school graduation approached," "Once I entered college," etc. Watch out for that in this essay and in your future writing.
Finally, let me say that I really hope you get this scholarship. Many students are active in causes, but too few understand how all of the issues -- race, poverty, pollution, animals, etc. -- are linked. We need more people like you in non-profit management!
Simone, EssayForum.com