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You came into this world empty-ended and will go one day like that. Attachment with materialistic pleasures will not help rather try to stay connected with your inner soul and Lord.
Don't ever doubt yourself as your mind will not be at peace. Trust the lord and keep doing your karma.
Too much eating, lust or selfishness should not overshadow the mind of a person. It can't take your soul to a higher reach. Desires take you away from reaching the ultimate goal.
Krodha, meaning anger often clouds your judgement and misleads a person in making any decision. So, be calm.
The Soul doesn't die as per Hindu belief, it is only the bodily form which a human self leaves upon death.
This is absolutely true when implied in our lives.
Yes, just do your job and don't worry about the results.
Yes, the Bhagavad Gita says so. Learn to be happy in all situations, caring not about your troubles and worries.