I wouldn't be quick as to say anyone has it worse off. Boys can have their list of hardships as well. They have to meet expectations of what is perceived as "manly" or else they are shunned or called "gay". They're expected to have a good career and to be chivalrous towards women, and put up with them whining about how they got it so bad. Males put themselves on the line and usually are expected to ask women out if they like them. Lots of time it ends in dejection.
Girls, yes, have a hard time because we have to go through childbirth, have periods, etc. But no one is making you give birth. And if you genuinely want to have children, then it will be worth it. Many women find pregnancy to be the best time of their lives, because they get to experience the miracle of life. Men and women both have social problems, it's not like girls are the only ones bullied, or have expectations for people of their own gender.
Periods are annoying, yes. But there's not much you can do about it without intense hormonal therapy. Personally, after a few years, i got used to it and now see my period as a sign that I am healthy, not stressed, and balanced.

It's all how you look at things, and in my opinion, you can't say, "we have it harder" because in all, we face the same amount of problems, though they may be different.