You have mentioned a lot of things that other people have a hard time overcoming
I wish I could give you a definite answer but there are way too many things inside my head that i can not even find the words to describe what is really the problem there are times where you feel happy and you feel as though everything is enough but there are some times where you still wish something better would happen it is a hard line to be between in on one side you have come to accept reality but on the other side you are wishing for a miracle
The reality of life is ups and down. Even the earth is spherical in shape and revolves around. meaning life is all about change, if you don't change environment will change you. The best advise anyone should need is an advise which you have given yourself. Thousands might give you there ideas but forget the meaning of choice. Not what you like that I might like so that's why people have choices. If your choice takes you to a good path you are lucky but if you choice doesn't favours you it becomes a mistake. So making a good choice or decisions is the only way succeed and it should be a summary of all what you have listened to