First of all, I'm really sorry if anyone's ever feigned attraction or laughed at the idea of dating you. That's some childish-ass bullshit, not to mention incredibly cruel. As a human being, you deserve better than that.

I won't lie to you, though. Looks, and, by extension, weight matter to most people. Especially to men, who are biologically prone to place much more importance on appearance than women are. Plenty of overweight women find partners, but you're completely right in your belief that it's much, much harder. Especially if you aren't flexible with your standards.

It's completely valid to decide to give up on ever finding a partner. I personally know quite a few people living happy and fulfilling lives on their own. However, if you decide that that sort of life isn't for you, I think you need to ask yourself what kind of person you'd want to date and then think about whether or not that person would realistically want to date you. Are you alright with dating someone who is roughly as overweight as you are? If you are, fantastic. If you aren't, then you would need to either lower your standards or work on yourself. It's a cliche, but when you really want something you can force yourself to do just about anything in pursuit of it. I know, because I've done it.

When I was 17 I was 5'10" and weighed nearly 300 lbs. At that point I made a promise to myself that I was never going to "settle" for anyone, so I had to change myself. Now I'm nearly 20 and 147 lbs, with all the nutrition and exercise habits mentioned in my post. Granted, I have a whole new set of problems as a result, but when I look in the mirror I don't regret my decisions. Because if I'd remained overweight, I know I wouldn't have lowered my standards, and I know I would be much less attractive than I am now, so I'd still be alone. At least this way I'm alone, comfortable my appearance, and comfortable in the knowledge that I've tried as hard I possibly could to become someone wanted by those I want. Even if I might not have succeeded.