You can do it!
Most people quit now because of three reasons:
1. They start out too fast.
2. They try and do too much
3.A partner quits
Rarely is because of money or real health issues. All three reason have to do with your way of thinking and not because of anything physical. Sore muscles will get better with time. Remember that you didn't get out of shape over night. So you definitely won't get into shape in that short of time.
Click the pic for a great workout by Men's Fitness.