My rear wheels are leanig in at the top and my tires are wearing on the inside. What could cause this? Is there a way I could fix this problem myself?

This may explain it:

http://www.bridgestonetire.com/tread-and-trend/drivers-ed/tire-tread-wear-causes


//

Under inflation. When the tire doesn't have enough air pressure, the center tends to be pushed up from the road. Thus causing outer wear on both sides. alignment problems cause wear on one side or the other. Over inflation causes the center of the tire to wear .

need rear alingment

It sound like the Camber is off in the rear. Did you have an alignment done after the new struts wear installed?

Your car needs a Rear Wheel Alignment, the components need to be inspected/checked for wear and then aligned. Worn ball joints, wheel bearings and so forth can cause bad alignment & tire wear.
Also it's hard to get an accurate alignment once a tire is worn on the inside or outside of the tread.

I don't know the year of your car, but ball joints and lower control arm bushings will cause this.

well uneven wear is not the bearings ,the main cause is worn shock absorbers ,wheel bearings will just make a noise

I'm guessing the lower ball joints are shot. This will cause the tires to lean in on the top and and wear the inside of the tire. I could be wrong! Try jacking the front wheels up and support the vehicle on jack stands, now grab the tire top and bottom and try to rock it in and out. If there is movement, you will have to have someone watch to see what is moving, while you rock it. If it's the ball joints, they will need to be replaced before you can align it. This can be spendy, there's a lot of labor involved.

Had a similar problem with a different car. Rear struts / spings were worn. Caused rear to sag enough to push wheels out and wear out inside portion of tires.