Certain medications do certain things to stimulate the brain to help the thought process. As RainLover71 said YOU need to find the right one that works for your specific need. On the other hand a certain outlook on life should change you behavior dramatically as well.
That's why it is important to get help with both medications AND therapy. The medications work by helping to allow more serotonin to circulate in the brain. Serotonin is basically a "feel good" chemical that helps lift depression and decrease anxiety by increasing our overall sense of well being and contenment.
Therapy helps you to work on why you feel the way you do about yourself. Even if there isn't some deep seeded issue behind your lack of self esteem and self worth (like a prior traumatic event), then therapy will be helpful to teach you how to retrain your way of thinking, to start replacing the negative thoughts with positive ones. A great type of therapy to accomplish that is CBT, or cognitive behavioral therapy.
You also have to be willing to do some work as well. Getting better takes time and patience. It's so hard because we want to feel better NOW. Try to be open minded, let the doctors make recommendations, and be willing to try what they suggest.
I do not think it is as easy as just willing yourself to get better.
Yes, it takes determination certainly. When I am down I cannot leave the house, I cannot leave my bed, I cannot be seen by people. I have depression and anxiety and my meds lift my moods and stop my panic attacks so I can find it in myself to get up and venture out if I can. Otherwise I could not, I have tried to force myself out when down which resulted in the most debilitating panic attacks. I lose interest in things, I simply cannot find joy! And why? Because our brains lack serotonin, a chemical imbalance which with the right medication and doctor consultation can improve drastically. Of course we then have to work very hard on ourselves, it's down to us to get better, the pills only do so much, but without them I would find it impossible.
Do not distrust the doctors. They are there to help, although it doesn't always seem like it. And yes, antidepressants can make you sleepy at first, but if they do the docs normally suggest taking them before you go to bed. It's about building up the antidepressant in your system to improve your mood so it's not a problem taking them at night, when you're going to sleep anyway.
I am very glad that you are positive and have found a little hope and happiness with the help of God ect. But please do not dismiss medication and its effects, I simply could not do without my meds when I'm at my lowest.
The key to medication is finding the right medication for you,it is very important that you work with your doctor on this subject because it can make all the difference.There are medications that help makes us feel better you just have to find the correct ones.It's always been a case of trial & error.