Loner and lonely two different terms. There's a difference between being loner and being lonely.
Loner
Being loner is a choice . When someone enjoy their own company,they love to spend their time with themselves. It is beneficial in many ways. You can find your own self. You can do whatever you like the most without any hesitation. You'll get more 'me time' when you choose to be alone. Sometimes happiness comes from ourselves first. You will start enjoying your life. If you are happy with your own self then it’s totally upto you. Stay like this and be happy.
Lonely
Being lonely is not a choice. When you enjoy others company than yours and when they gone from your life you became lonely. It is like when you are missing the absence of someone else's presence. This is time you feel you are lonely. You feel there's no one with you. You get hurt and pain became a part of your life. This is where all the depression, frustration thing started. Life became miserable . Then we attempt something out of our senses.
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This is me all the time. I mean the past few chapters of my life, I tend to give myself to help others to the point I forgot to take care of myself. Being a loner is indeed a choice. It's like a self love to others.