I got this plant and I don't want it to die but I don't know what it is or how to take care of it! Please help!its already lost some leaves and is leaning what do I do?

It's losing its leaves and leaning because it's far too wet and has not nearly enough light. It needs brighter, more direct light, for longer periods, and drier, rockier, soil. I don't know the exact species, When a lot of succulents start to etoliate it's harder to tell them apart.

It looks like an (etiolated) Graptosedum to me:
Graptosedum (XGraptosedum)

If it was too wet, it would be rotting. I would ease it into more light, up to being in the sun all day if possible. The short warm season in your area might eliminate that possibility, but while inside, definitely put it as close as possible to your most sunny window.