I would suggest library assistant, provided you find a library thats suited to your interests and/or doesnt have much public contact.. There is a lot of behind the scenes things to do at a library and it can be very enjoyable if its related to your interests, and once its become known what your area of interest is, then you become the expert to go to on the topic.
You mentioned being clumsy so i wouldnt recomend lab work, even though there tends not to be much social contact dropping and breaking things is an issue