I can relate man, I was around 400 lbs at 28. People treat you different when your fat and they really treat you very different when your fat and self-conscious (which was what I was). The truth is only some (and I stress the word some) women will date a fat guy. Most of these women will date you if your either very funny or very self-confident. I spent 6 years during most of my 20's near 400 lbs and during those 6 years I spoke with maybe 30 women my age, I had 2 crushes that ended in rejection, and I was very lonely.
The first thing I would do is figure out a plan to help with the weight. I lost my weight on my own and I can tell you now that it is 10x harder then having a plan with a friend or professional. If your serious then hire a professional. It's much cheaper in the long run and has a seriously higher chance of being successful. Do the following:
1. Gym Trainer : This is the best option because there are no excuses, they will make you lose weight whether you want to or not. Don't go some of the time either. Make it a 5 days a week thing with training whenever you can. Don't give yourself any time to make excuses. The gym can make you self-conscious at first when you see so many healthy people in there but I promise you will be surprised at how many 300lb people come in as well. I know the embarrassing feeling of someone seeing what you have done to yourself, trust me, 300 lbs is actually extremely common. Don't feel the need to run or kill yourself on the machines. Exercise slow at first and then slowly increase your pace. Have a plan to gradually increase the distance or time every week.
2. Get a nutritionist or join an online nutrisystem or weight watches : This seems like a cliche but if you actually follow their program you will feel better and have more energy. You MUST exercise also, many of us try to act like we will lose weight through diet. This is **** and we know it, it's an excuse not to have to exercise and it never ever works completely. Unless you live on salad and water for months dieting won't do **** other than let you lose a pound a week if your lucky. What it will do is make you feel energetic and motivated knowing that your not working against your time at the gym.
3. Watch the **** out of the Biggest Loser. This stuff might be crap programming but the Biggest Loser will show you that it's possible to lose weight fast. Yeah, we know it's healthier to take your time. Sometimes you just need to see those before an after pictures to let you know it's possible.
4. Meditate : Just sit still for 15 minutes without thinking of anything but breathing in and out. Do this twice a day and use a timer so you don't have to wonder how much longer you have. You will be amazed how much this evens you out and takes away stress. Every time I felt overworked or depressed I would meditate. It really helps if you actually do it. Our minds are so busy all of the time sometimes a short break can bring you back to what matters.
If your like I was then I am guessing you want to lose the weight fast. The truth is you can lose 100 pounds easily in 3 months if your willing to bust your ass. It will suck. You will sweat. Your food will taste like **** and any fat or cynical people you know will purposely try to tempt you to take a break. It only took me around 8 months to lose 200 pounds. The only thing I regret is not getting professional help because I probably could have lost the 200 pound in 6 months with it.
If you need someone to talk to then private message me. There is nothing regarding your weight you can tell me that I haven't experienced. I know it seems like such a serious thing but I promise it is only in your mind, losing weight takes no time at all if you keep a healthy mind.