Have you got somewhere you put it up next to a fence, and fix it to that? On gardening forums they are known generally as 'Blowaways' because that is what they tend to do.
However they are well worth using if you can fix them down well.
You can still start a few tomato seeds off on a windowledge indoors, with a view to moving them into the greenhouse in a few weeks time, likewise a couple of cucumbers .... or if that's a bit scary buy a few plants of each in the garden centre (also in a few weeks, as it is still too cold now)
You can sow flower seeds of hardy annual flowers, inside and pot them up as they grow, or move them out to the garden/plot.
Good luck - try anything you fancy, some things work, others don't. But if you don't try you'll never find out what works for you