Easily upset 7 year old boy

[Snowy Love]

DS has always gotten upset over things, but the last few months it seems to be happening more often and he's getting upset over the same things over and over again.

- In October or November, a girl thew his lunch box in the bin & he seemed unphased until he realized that his Monsters' University cooler bag was gone (& the replacement I bought wasn't the same style). He's burst into tears over that multiple times, most recently last week. He went through 3 lunch boxes in three weeks & that's the only one he blamed on someone else, I suspect maybe one or both of the other breakages was due to other kids & I was frustrated & went on about it a bit.
- Last day of school he was eating ice cream at after school care & cried because he's going to miss year one & his teacher (I don't know why if the kids throw his lunch box away and his teacher was difficult to communicate with (that may be my issue))
- DH got a new company car & he's cried over that a number of times too - "I just miss Kade (that's what he named the old car) so much"
- he's upset by the new year, he wishes it was still 2013. I've explained that a year is just the amount of time for the earth to go around the sun and that time moves at one second per second, used Star Wars & Doctor Who quotes to no avail.

He really doesn't like change! I want him to do an after school activity, but can't convince him to do it - I've suggested karate, Cubs & drama classes.

Is it normal for 7 year olds to be like this? What can I do to help him?
Thanks for your help.