[trunker]

they are both correct, but it depends on the context.

when you have too many things to do you could use:

I am under alot of pressure from .....................(work, school, society,etc)

tension and strain are slightly different. think of it this way,.....

strain- you are holding something heavy up above your head, your arms get tired, they are straining to hold something up. so strain refers to you doing something. the strain of working for sacho-san cos he is an asshat.

tension is a stretching force, like on a string or a piece of gum. in your context you could say that so many things are pulling you in different directions. its like an external force is affecting you, unlike strain where you are the one exerting the force.

perhaps someone else will chime in to explain it better as i seem to have made a bit of a mess of it all :P