I'm a college student, and English is my major.

I just want to seize every opportunity to improve myself, both inside and outside.

To make every day count is my short-term goal.

The first letter of each sentence should be a capital letter. Commas should be placed where you might normally have a pause in your speech (there is more to it than that, but it's an easy way to remember).

Heighten usually refers to physical height, such as how tall someone is. I am guessing that you want to improve yourself, instead of heighten yourself.

I hope that helps!

First notebook entry: Introducing myself

i'm(I'm) a college student and english is my major. i(I) just want to seize every opportunity to highten myself both inside and outside(out). make(Making) every day count is my short-turn(term) goal.

First notebook entry: Introducing myself

I'm a college student and english is my major. I just want to seize every opportunity to improve myself both inside and outside. Making every day count is my short-turn goal.