Its good that you are seeking help your problems. And life is beautiful stop thinking about killing yourself and also the symptoms you are describing suggest having depression which is very common disorder and occurs due to chemical changes in the brain affecting our thoughts mood behavior and judgment as a result of some stress or any other medical condition. Get your thyroid function tests done. Consult psychiatrist.

It seems like depression.. But careful evaluation is needed I suggest you to Consult with me or any psychologist for same All the best Seek help

Hello Friend, Good that you are seeking a help here. Negative thoughts, feelings low about yourself, loneliness, fear of failure etc are clear symptoms of depression and anxiety. You may be worrying or thinking too much about some past unpleasant incidents or may be  thinking about future or relationship issue. Such pre occupied mind will cause disturbances to both mind and body. Having experienced such emotional disturbances affecting your day-to-day, why don't you take the next logical steps to address it by take a professional help. May be you need a guidance of counseling support to first assess yourself in detail with your symptoms. This will help you to identify the root cause for your emotional disturbance and also a suitable solution to overcome the same. Feel free to reach out to me directly if in Bangalore  or online through Practo for further detailed evaluation and recommendation. Be positive. You will be alright soon.

Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. Consult a Psychiatrist for a detailed assessment. It is likely with medication and counseling the symptoms will improve. If you are feeling suicidal or hopeless consult a Psychiatrist immediately.

I think you are unhappy about yourself or about something else. Before taking any decisions, do consult a psychologist in your city personally.

In order to confirm if u r suffering from depression, u need to visit a psychiatrist. For me to help u more, I need to know more detailed history and need more information. How serious are u when u say that u feel that u r a failure?