1.
Drinking like you're still in college.
3.
Too much fried and processed food.
5.
Staying in relationships with people who aren't supportive or kind.
6.
Spending money on dumb shit.
7.
Falling into insurmountable debt.
9.
Screwing up your employment history with stupid stuff.
10.
Spending too much time on the internet.
11.
Caring too much about what others think.
12.
Setting unrealistic milestones for yourself and feeling like a failure when you don't reach them.
13.
Blowing off your education, especially if you're paying for it.
14.
Waiting too long for the right job to come along.
15.
Injuries to your back, knees, and shoulders.
17.
Always staying in your comfort zone.
18.
Putting off the one thing you've always wanted to do.
19.
Putting off the habit of exercise.
20.
Jumping to conclusions in your judgement of others.
21.
Neglecting your teeth.
22.
Having a kid before you're ready.
23.
Frying your skin in the sun.
24.
Wallowing in self-pity.
25.
Mistaking impulse for intuition.
26.
Getting a meaningless tattoo.
27.
Putting yourself voluntarily in serious physical danger.
28.
Drifting through life without setting any real goals.
29.
Freaking out about being single.
30.
Being afraid to fail.
Inspired by this Quora post.