The 4 biggest differences between being in your 20s and your 30s

If your 20s are considered to be a dress rehearsal for adulthood, your 30s are the real performance.

The permission to flail and fail in well-meaning youth is stripped away. Now is the time to achieve traditionally "adult" milestones. This includes — but is not limited to — procuring the following: an impressive title to update your LinkedIn page with; a good-looking life partner; an Instagram-worthy wedding; one or more cute, undemanding children; and a house with multiple bedrooms for said children.

Those who fail to meet these ambitious milestones may feel inadequate. Those who are striving to achieve them may feel pressure to compete with their peers. And, man, is this a bummer. Once upon a time, us 20-somethings shared our mistakes with ease and humor; as a 30-something, this type of breezy, endearing vulnerability is increasingly absent.

I don't miss the messiness of and uncertainty I felt in my 20s, but I do miss the camaraderie I shared with my contemporaries over said messiness and uncertainty. Which, incidentally, doesn't go away once you have attained a big house, a killer job or a one-year-old that knows the alphabet.

As a 20-something woman, you are essentially untouchable — society loves youth, and so does your metabolism! Your hangovers are cured by a greasy breakfast sandwich, your neck isn't sore after working 12-hour days, and jean shorts look cute on you.

But once you hit your 30s, things begin to change. You're not exactly "old," but you do have some faint lines on your forehead (Botox?!). Hangovers are 24-hour affairs. Jean shorts look less cute. And if you're single and over 35, the clock is ticking. Consider freezing your eggs immediately!

There's no denying that when women hit their 30s, age starts to becomes a factor. I've noticed subtle and not-so-subtle cultural reminders that I am, indeed, aging. Which is fine — I am! What I find distressing, however, is that women in their 30s are expected to "fight" the signs of aging with everything in their arsenal — as if there exists an indisputable truth that somehow younger equals better.

The irony is, many of the 30-something women I know are the most beautiful, authentic, and dynamic versions of themselves right now. They don't want to go back to being their 22-year-old self — except, maybe, when they have a hangover.

My 20s were an undeniably self-indulgent time. I spent the entire decade blithely indulging my wants and desires. I traveled tirelessly, ate out at overpriced, blaringly-loud restaurants and spent way too much money on handbags.

Yet despite the fact that I often did what I wanted, I didn't know what I needed. For example, some of those dinners out were spent in an anxiety-filled funk. I couldn't put my finger on what I needed, but it certainly was not another $20 gimlet.

Self-awareness has come with age, and it has transformed my life for the better. Self-awareness has helped me to identify what my needs are. It has also taught me that my needs are very, very different from my wants and desires. The former are essential and non-negotiable; the latter are ephemeral and superficial.

For example, in my 20s, I wanted new clothes constantly — an expensive, self-indulgent, and stressful habit. In my 30s, I've refocused that energy on nurturing my needs — a loving marriage, strong friendships, a healthy lifestyle, and hobbies like reading and writing.

Having attained greater self-awareness has made me more confident, more relaxed, and generally more sympathetic toward myself and others. It has also made my 30s a heck of lot more fun than my 20s — even without those gimlet-filled dinners, which still happen occasionally.