Running multiple 20A circuits to a shed
The NEC only allows a single feeder to a building (NEC 225.30). If you want seven 20A circuits you would need to run a single set of 4 larger wires to an electrical panel, drive a ground rod (or rods depending on local interpretation) and break out your circuits from there.  A good plan would be 3/#6 + 1/#8 ground being fed by a 60A breaker in 3/4" PVC.

If the single feeder consists of one "Multiwire Branch Circuit", being two 20A circuits being fed by 12/3+g UF (or 4 #12 THWN wires in a conduit) being fed by a two pole 20A breaker then you would still need a disconnecting switch where the feeder enters the building, but a single Multiwire Branch Circuit allows not driving a ground rod. NEC 250.32