The one lesson I have learned in life is that it's almost never about you.

People get tired or stressed from crazy work weeks, from over-extending themselves etc.

I almost never cancel plans, but when I do, it's always during the week.

It's okay to be a little sensitive but honestly most of the time it really is just something going on with them.

Best thing to do is just have some fun solo and turn it into a nice night to relax and do your own thing.

i agree, being ditched is more than annoying...and i'm glad you said the very last thing you did: "does this mean i'm lonely?"....you are very reliant on your plans and you probably feel like if you get ditched you won't have anything to fall back on...i would try to get busy, make new friends, (if you're single) then try to meet men in new ways, and take up a new hobby....that way when someone cancels on you, you have backup....really try hard not to be needy, too...i'm not saying you are and we don't have enough info here but make sure you voice your opinion about being disapointed at being ditched but then move on...don't dwell and don't make people think you're dependent on them

lol, "last minute". Here I was thinking that you're supposed to meet your friend at 5p and she calls at 4 saying she won't be able to make it. Canceling same day, while sh*tty, doesn't seem so bad to me.

I have a couple of family members who have a bad habit of doing this. It's normal to feel disappointed - you've been looking forward to the event and then the person cancels on such short notice that you can't really make other plans.

I started saying this when it happened to me: "Oh shoot, I wish I had know earlier because Jessica invited me to an art show but I said I couldn't go. Oh well, maybe next time." This gently reminds the person that their changes affect not just you, but other people as well. And that they should give you more notice.

If you're finding that many people don't want to make plans with you at all, or that pretty much everyone cancels, you may need to figure out if there's a reason they don't enjoy your company.

At the same time, if the same people bail over and over again, stop making plans with them. If they ask, say "Well to be honest, I'm never really sure if our plans are going to go through."

It bugs me when people cancel. Really bugs me. If its a couple of days in advance its not so bad, but if its the same day, then I am annoyed.

Its normal to be bummed about people cancelling. But to get this worked up about it may signal a deeper issue at hand. Maybe you should try to talk to a therapist or a counselor or someone that can try and figure out if its just being very sensitive or if its depression.
When I was depressed, I would get the same way. I would take it very bad if someone did this. But I'm better now after working it out with a therapist.

i hate it when its the same day. especially when friends do it. which is rare because i make sure they dont do it again or i just stop talking to them. talk to your sister about it and then just go about your own business, if she wants to go out again do something small like coffee. these things should be worked on a scale if people do it out of habit. if they want to be trusted again they should commit. unless it was a emergency of course.

It's very normal to be disappointed.

I absolutely love your comment popgoestheworld, it's very insightful.