tipper, that's a big list to work on! Get to work, but don't try to remake your whole life and who you are overnight. It takes time, and most importantly be true to you.
Loneliness is very hard, but don't just fill your life with meaningless stuff so you're not alone. That won't get rid of being lonely. Look inside and find what things will make you happy. Like Beatrice said, you may find you like being alone. I did, and now with H being home it is an all new kind of adjustment for me.
Start looking for little things that make you smile, things that boost your confidence.
Live your life while you are still living. Riding the trail less traveled.