To reduce the lifting load by about 50% you can do the same exercise, but do it on your knees. Keeping a straight line from neck to torso is still important, so please pay attention to correct body alignment as you perform your workout. Keep weight load on the fat part of your thigh just above knee cap(patella)
If all the above options are still too challenging, one final variation exists. The "wall" push up dramatically reduces the pressure on the arms, upper back and abs. The closer you stand to the wall, the easier they are to perform, but remember, it's still important to be aware of your body alignment as you perform the "wall" push up. As you gain strength and confidence, move your feet slightly further away from the wall to make the workout more challenging. Feel free to consider moving to the "bench" or "knee" style push ups once your initial strength has increased.