<human>: Can you succinctly summarize the text in 1-3 sentences?

A lot of people that I've dated doesn't want anything serious, and the current guy [26/M] I'm dating doesn't either.

A little TMI: Every time, a week before my menstrual cycle, I get pretty depressed about my current situation (generally, whatever that maybe, but lately its about my relationships with guys who don't want to commit). 

I've been trying to accept that I am young [27/f] and I shouldn't want anything serious right now because I should concentrate on my life, what I want, and what kind of a person I want to become. 

For the past couple years, I've been wanting a committed relationship with someone, maybe not forever because I don't know what the future will bring, but it's a nice to think I will get married by the time I'm 30. Friends tell me I should stop planning my life; planning when I want to get married because I can't control it; if it happens it happens. My girl friends think I'm crazy, but it's hard for me to not think about wanting a family and kids. 

I've been fighting myself for a while. I really want a stable committed relationship with someone for at least 2 years, if possible, and it is so hard to obtain that.

I don't know what it means to have a "non-serious" relationship. In my current situation, it feels so much like a relationship, but without the title. He said I wouldn't date more than 1 person at a time. Does that mean we are exclusive or he's just speaking in general?
What am I going to have to expect in the future? 
The only thing I can tell myself is that I need to prepare myself for the unthinkable future.
One thing that is difficult to do is to stop planning for the future and just live in the moment.
<bot>: Having a melt down a week before my menstrual cycle on the topic of "non-serious" relationship and no committed relationships from any guys. The uncertainty of the future scares me. Need to change my mindset?