"He gives power to the faint,
and strengthens the powerless.
Even youths will faint and be weary,
and the young will fall exhausted;
but those who wait for the Lord shall renew their strength,
they shall mount up with wings like eagles,
they shall run and not be weary,
they shall walk and not faint." Isaiah 40:29-31
Look up, not in. It's so easy to remain introspective when bouts of depression get bad. Make a habit of turning to God and His promises rather than dwelling on your own thoughts when things are going okay, and it will be much easier to remain grounded in Him when they get really tough.
If Jesus is the example of the abundant life, then we know that no version of it will be without grief or suffering.
He knows that you will have dark days, days when it will be hard to see or feel His presence. For some of us, those days can go on for years. But those are the times that it is imperative that we know who He is, and who we are in Him.
Lord Jesus, You are the source of all light and joy. Help me to seek you when I feel surrounded by darkness.