Ethernet help

I have a macbook, 13 inch, last generation. I must use an ethernet cable to connect to the internet in my dorm room, and I find that it won't "hook" into the ethernet slot.

It fits into the slot just fine and I can connect to the internet, but the cable doesn't "hook" in and can easily slide out. I've tried numerous generic ethernet cables to no avail. Is there any Mac brand ethernet cable I can use or is it just some random defect on my laptop?

 

Thanks for the advice. I checked out the port and it looks too short. Thats really the only thing I can think of. Everything else looks about the same as my friends, but maybe just a little shorter. Any tips on a fix? Or am I stuck with it this way?

 

Alright. Thanks for the responses guys. I'll probably take it to an apple store to see if they can do anything.