Hello,
I don't see anything that confirms your computer has been hacked.
SYN_SENT simply means your computer is trying to establish a connection with another computer or server, but the connection hasn't been completed yet. This is normal network activity.
"Cannot obtain ownership information" means Windows couldn't identify which program or process was responsible for that connection. This can happen for several reasons, and it doesn't necessarily mean anything suspicious.
Also, netstat is a network diagnostic tool, not a tool designed to detect hacking. Seeing unfamiliar IP addresses doesn't automatically mean someone has access to your computer.
One thing I'm curious about: What originally made you suspect that someone had remotely accessed your computer?
Did you notice something unusual happening, such as your mouse moving by itself, programs opening unexpectedly, or an unfamiliar sign-in? Or was it simply the result you saw in Command Prompt?