I am sorry you are going through this. You are not alone. There is a ton of experience, strength, and hope in Al-Anon. Please consider giving the Al-Anon program a serious try. I have been down a similar path with my father.
I am in my 50s and have been working a strong Al-Anon program since I was 35. The changes in me have helped my situation tremendously. I have felt most of what you described above. I came to Al-Anon thinking I did not receive an owner's manual for living. I watched people my age do things in life that baffled me. I felt like a misfit and alone. In Al-Anon, I learned that alcoholism is a disease that affects not only the alcoholic but also the family and friends of the alcoholic.
Here are a few things I heard or benefitted from in my early Al-Anon experience. I hope they help you too.
We do not go to the hardware store looking to buy a loaf of bread. In the same way, I do not go to my alcoholic father looking for love.
The three Cs and A's in Al-Anon helped me see things a bit more clearly. I didn’t Cause, can’t Control, and can’t Cure the disease of alcoholism.
The three As helped point me in the right direction and provide a useful framework. Awareness, Acceptance, then Action.
Reading From Survival to Recovery: Growing Up in an Alcoholic Home (Hardcover book) helped me see that other people have been through what I went through and managed to find recovery and thrive.
What benefitted me the most was going to meetings, getting a sponsor, working the steps, then getting involved in Al-Anon service so I might help others. If you are looking for specific steps to take, please try six different Al-Anon meetings to see if it is for you. Each meeting has a different personality. Some meetings may not click for you and that is okay.