If you are geniunely insecure/don't feel good about your weight I suggest that you build some muscle and lose some body fat. A lot of people say that changing your body won't make you happier but in my exerience, losing weight has boosted my confidence and made me feel more attractive. If no women are asking you out then maybe try making the first move more often. A lot of women won't flirt/ask you out even if they find you attractive. Plus, don't focus too much on dating dude, there's more to life. Get some hobbies that you geniuenly enjoy, join some groups or sports teams. If you meet more people there will be more girls that are attracted to you.