[Some of his defensiveness drains a little more at how genuinely concerned Ian is, and he gives another, longer sigh as he crosses his arms and shrugs.]
I'm not really good at anything else.
[Which isn't entirely true, but the idea is probably clear enough; he can't help in the sorts of way Ian might, in building and fixing things. He glances off to the side briefly, shifting on his feet a little.]
I want to be doing something that'll actually make a difference.
[Both for the sake of other people and for himself; if he can help people, then maybe it'll give some meaning to getting through everything else he's dealing with.]
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I'm not really good at anything else.
[Which isn't entirely true, but the idea is probably clear enough; he can't help in the sorts of way Ian might, in building and fixing things. He glances off to the side briefly, shifting on his feet a little.]
I want to be doing something that'll actually make a difference.
[Both for the sake of other people and for himself; if he can help people, then maybe it'll give some meaning to getting through everything else he's dealing with.]