It seems like you had good rigor in your curriculum, but if your rank is below the top 25%, it is likely there are lots of students from your area and school applying as well.
OSU also takes in lots of transfer students. So if you get a good offer (program you want and affordable) from another school and decide later it isn’t working out for you, definitely apply to OSU again.
Here is a summary of the pathways (besides transferring in) available to instate students:
“Once it is determined that you are admissible, you will be considered for enrollment in the college of your intended major.” http://undergrad.osu.edu/apply/freshmen-columbus/who-gets-in
In other words, if you are accepted to the Columbus campus they evaluate you for (in your case) the College of Engineering. The College of Engineering either directly admits you or…
“Students not eligible to directly enroll in the College of Engineering may enroll in Science and Technology and Environmental Exploration (this applies to domestic students only).” https://engineering.osu.edu/academics/admissions
So students that aren’t directly admitted to Engineering "on the Columbus campus must meet these requirements for admission into the College of Engineering pre-major program:
2.5 Ohio State GPA
C- or higher in Math 1151
Credit for one of the following courses: Chemistry 1210, Chemistry 1250, Physics 1250, Biology 2100
1 semester of full-time enrollment as an undergraduate student at Ohio State" https://engineering.osu.edu/academics/admissions
I hope you picked Marion as your alternate campus. Marion is the one with engineering classes and a new science building. “Ohio State Regional campuses operate under an open access admission policy. This means that students who have graduated from an accredited Ohio high school or earned their GED have the opportunity to earn an Ohio State education” http://osumarion.osu.edu/future-students/undergraduate-students/requirements/ If you get deferred you may want to visit Marion and change your campus preference before Marion’s Financial aid deadline. They offer a ton of merit aid and have private student housing complex with private bedrooms/full kitchens in walking distance.
So regardless of how your admission decision for main campus goes, there is definitely a path at OSU, even if you aren’t directly admitted to main campus or the College of Engineering. That’s not necessarily the case at other schools.
If you want to be a Buckeye, you’ll have an opportunity to be one. Whether or not you become one, is up to you.