Why are these people trying to break into my computer?
What you are seeing is just bots. I run a number of linux and unix servers and I see them all the time. They scan a random range of IP addresses and subnets and then when they find an open SSH port they start trying to brute force common logins and passwords. Those computers are probably just zombies
You're running linux so install "Fail2ban" which will ban an IP after three attempts. It's configurable so adjust it to your likes.
Another tip to help you is to change your SSH port to something nonstandard such as 2222, 2200 or whatever you can remember. The bots I've seen always scan standard ports so that alone should stop them from trying to brute force your box.
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