How can you have time to feel lonely? In Toronto, unless you are not working, everybody is busy working. It is often dog-tired after a full-day work.
You are lucky that you have surplus time to feel lone.
I'm really busy in Canada because I do a lot of volunteering for community service. Chinese people are good at learning things, but not get used to be invovled in volunteer. If you have time, you could be a good leader for group of people. Of course you have some personal space, better to keep balance with people and loneliness.
You don't need worry about your situation. most of immigrant have same problem as you,especially after life getting stable.
Go to church might be a good choice, you do not have believe God. or find something to do during your spare time.
Loneliness come from inside, same as happiness.
Good Luck!!
孤独的感觉:加国移民生活的无言之痛