Right now, I can't think of just one word, but this list sums up what I think about myself and how I see myself.
1: Despair.
2: Demoralized.
3: Redundant.
4: Depressed.
5: Alienated.
6: Irrelevant.
7: Isolated.
8: Alone.
9: Weak.
10: Inferior.
11: Hopeless.
12: Disconnected.
13: Subhuman.
14: Failure.
15: Rejected.
16: Substandard.
17: Empty.
18: Withdrawn.
19: Abandoned.
20: Adrift.