Ella, I am reading you and thinking "these thoughts about the future and life in general is typical of the pessimism that depression creates"....
Life is good, you have plenty of time to meet Mister Right and the future is not full of stress although depression will convince you of the contrary.
Have you done the PH-9 test for depression?
http://www.med.umich.edu/1info/fhp/practiceguides/depress/phq-9.pdfI really, really think you need to go and have a chat with your doctor. He'll not prescribe antidepressants if you do not want to take them but I think he needs to keep an eye on how things are progressing for you. A medical treatment (and that includes CBT) would help you feel happy and relaxed and not see the future as such a gloomy / stressful place.
You do not need to suffer the way you are suffering now. If you had a really bad headache, would you refuse to take painkillers? The same applies for depression.
These are some of the symptoms of depression. If you have some / many of these please go an see your GP xxx
Symptoms:you can’t sleep or you sleep too much
you can’t concentrate or find that previously easy tasks are now difficult
you feel hopeless and helpless
you can’t control your negative thoughts, no matter how much you try
you have lost your appetite or you can’t stop eating
you are much more irritable, short-tempered, or aggressive than usual
you’re consuming more alcohol than normal or engaging in other reckless behavior
you have thoughts that life is not worth living (Seek help immediately if this is the case)
Feelings of helplessness and hopelessness. A bleak outlook—nothing will ever get better and there’s nothing you can do to improve your situation.
Loss of interest in daily activities. No interest in former hobbies, pastimes, social activities, or sex. You’ve lost your ability to feel joy and pleasure.
Appetite or weight changes. Significant weight loss or weight gain—a change of more than 5% of body weight in a month.
Sleep changes. Either insomnia, especially waking in the early hours of the morning, or oversleeping (also known as hypersomnia).
Anger or irritability. Feeling agitated, restless, or even violent. Your tolerance level is low, your temper short, and everything and everyone gets on your nerves.
Loss of energy. Feeling fatigued, sluggish, and physically drained. Your whole body may feel heavy, and even small tasks are exhausting or take longer to complete.
Self-loathing. Strong feelings of worthlessness or guilt. You harshly criticize yourself for perceived faults and mistakes.
Reckless behavior. You engage in escapist behavior such as substance abuse, compulsive gambling, reckless driving, or dangerous sports.
Concentration problems. Trouble focusing, making decisions, or remembering things.
Unexplained aches and pains. An increase in physical complaints such as headaches, back pain, aching muscles, and stomach pain.