Hi Rachelfaith05:
First, you can help participants here by identifying where (in the world) this plant is growing - since this is an international site and plants could be from North America to Australia to India to Europe. Context makes a big difference.
Next, you can post more images! Since you say you have more instances of this kind of plant around your property, never be reluctant to provide more information. The great thing about this site is that it serves as a permanent educational tool for others that will come read these threads in the future.
Finally: you could cut off a bit or a chunk of one of these plants (get a whole stem or branch with plenty of leaves/flowers/buds) and lay it on a sidewalk or driveway to photograph thoroughly. Take pictures of the top and bottom of whole leaves (including all the leaflets of a compound leaf as in the plant shown), and closeups showing how the leaves attach to branches, closeups of buds, flowers, seeds, etc. Wear protective clothing and gloves if you are unsure or worried about potential contact with the plant.
Enough epistle of posting protocols. purpleinopp is correct - that is certainly a young Ash plant (Fraxinus sp.), and porkpal is also quite correct that it is NOT a Poison Sumac or other related poisonous/irritating species.
You will find that seedlings of Ash will come up wherever their seeds may blow in on the wind, or wash in with rainfall. It is a species with pinnate compound foliage (composed of 5-9 leaflets typically, arranged along a midrib known as a rachis) that are arranged in opposite fashion along stems/branches.
Your plant is either a White Ash (Fraxinus americana) or Green Ash (Fraxinus pennsylvanica), which are two common native species in eastern North America - if that is indeed where you are from and these plants are found. More detailed imagery might help make the distinction, if you are interested, but from where you say these are growing, you probably want to delete them because those are spots that won't accommodate a full-grown shade tree.