A couple of different fics have posited that Bucky hadn't been around, Steve would have died of, basically, ill-health and poverty, and that really struck me as accurate. So I think that Steve's fears center around being a burden and being unable to contribute.
Oh god, that hits me so hard in the fucking feels.
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Oh god, that hits me so hard in the fucking feels.
DOESN'T IT JUST?!?!!?