Don't give up.
Sometimes people reach a point in their lives where they have invested their time and energy in the wrong things and the result is loneliness and regret. If you feel like too much time has gone by and starting over seems insurmountable, there is hope.
You find it in unexpected places. You find it by realizing you have nothing to lose by making the time you have left matter. I found my entire career path volunteering in a maximum security prison. When you move forward, hope can be found in the most surprising places.