This isn't for anyone specifically, so don't read into it like I'm coming at someone in particular. I've just been asked this a lot lately so he's my answer:
Working out doesn't directly mean you're just going to consistently drop weight week over week. Get off the scale! You need to focus on more than just lbs.
How do you feel? How do your clothes feel? What can you do now that you couldn't do before you started training? There are a myriad of indicators that you are healthier and more fit. But too many people beat themselves down about the lbs and start in with the, "I keep training and I'm not losing anymore weight, why even bother?" Don't expect or give any pity if you say or hear this. You're responsible for being where you are now, and you're sure as hell responsible for getting yourself where you want to be.
The number one thing you have to remember if you are obsessed with lbs, and can't keep yourself off the scale, is that weight loss happens in the kitchen as much as it does in the gym. It's a marriage of the two. Working out and eating right. I tell people all the time, "I don't know what your eating or drinking." It's always the diet. It's about calories in vs calories out. What good is busting your tail to burn 600 to 800 calories 3 or 4 times a week when you're ingesting 3,000+calories, sugar, chemicals in processed foods, etc a day. The math is obvious. Starving yourself is just as bad too.
Please think about it all before you start convincing yourself to quit. Imagine what will happen when you stop training all together. You wouldn't put a high end supercharged V8 engine in a car and put cooking oil in the tank...no! You'd put the top oil, fuel injection cleaner, gas, etc. in everything else in life we put the best fuel, the best recommended whatever to make sure our things perform at their best. But expect less from our bodies. We think it's going to function and burn at a high level with sugar in the gas tank! Please think it through and do the research.