Amen! Ha. Someone already corrected this for you but- I love it just because I agree. So love for you.
-Stitch

Well, although I like your points, I must point out some grammatical errors. Since this was a school essay, maybe it will help you:

1) “No more having to wonder if they’ll like you or not, or about all the future family gatherings like Christmas and weddings.” This is a sentence fragment.

2) You use the word, “you” a lot. Try to avoid using you in a formal piece…Second person is not usually accepted. Try using the word “one” more often.

3) Avoid contractions. Formal pieces of writing do not accept them either.

4) You use the word also a lot throughout this piece. Try to change it to words like, “in addition to,” or “, too.” at sentences’ ends.

5) You start one of your sentences with “By not being married…” This is a weak beginning. Maybe saying something such as, “Without the commitment to another being…” Something stronger might spice this up a bit.

6) You start more than just that sentence with By…, which is a prepositional phrase. When a sentence starts with a prepositional phrase, a comma should follow it. If possible, though, try to use these sentences sparingly.

7) “Many securities also come in with the marriage package, but marriage doesn’t always equal happiness, but being single at least gives you the opportunity to seek it.” This sentence is really complex. Try to make this sentence simpler. Change it to something like “Many securities come with marriage but happiness is not always one of them. Being single is an opportunity for one to seek it.”

8) “There are obvious reasons why people choose to be married, the most obvious being because the couple is in love.” This is your first sentence. This is also a comma splice. Either change the comma to a semi-colon or make two separate sentences. The second independent clause is awkward though, so try changing, “the most obvious being because…” to “the most obvious reason is the couple’s love.”

9) “Marriage usually equals family and if you don’t want children then being married is not the best course to take.” Try splitting these into two sentences. It will make your piece a lot stronger.

10) “…to liver comfortably” I think you meant live. Simple typo; just try to change that.

11) “As a single person you’re also able to go out with friends and other acquaintances whenever you have the time and don’t have to worry about any plans your spouse might have had or about whether you have permission to go or not.” That is only *one* sentence. Shorten that sentence. You have many like this that are rather verbose. Try to shorten your sentences and make them into two separate ones.

12) “Marriage is a wonderful thing to experience since it offers financial security and companionship, but the concept of marriage isn’t for everyone and if being free to travel, of not receiving any unexpected expenses, or no obligations to in-laws, then the single life is the way to go. After all, being single is being free.” This is your concluding paragraph. Try to refrain from using the word “and” in an opening sentence to a paragraph. List the reasons why in another sentences. But I like your last sentence. It is strong and well written. Just fix the interior of the paragraph.

In addition to all of this, more examples that answer the question "why" might be better. For example, choose a couple you know or statistics to back up your argument. Numbers and real-life examples can be more convincing to individuals that are reading your works.

Good start. Hope that helped you. = )
Let me know what you get on this paper.