In any case, do not despair! If the guy does not pay attention to you, that doesn't mean you are not attractive or unworthy of it. Act wisely and carefully, try new tools, but do not abandon your goal, even if it seems unachievable.
Find out what girls like you are interested in the young man. Try to understand what constitutes his ideal, and then become them. It is not only appearance, but also Hobbies, preferences, etc. Find out what kind of music does your partner like he spends free time, what movies he loves, etc., and then carefully study his interests. For example, if he supports a certain football team, you need to know more about the rules of the game of football, the history of his beloved team, its success, composition, etc.
Dress is beautiful, but not vulgar. Do not use too much makeup: if you dress provocatively, decent young people are unlikely to pay attention to you. If you found out that your partner likes it when girls wear long flowing dresses start wearing them. The same applies to hairstyles, shoes and accessories: be guided by the preferences you are interested in a guy.
You go to those places where he often goes, but try not to RUB his eyes. For example, if your partner frequents discos, learn to dance beautifully and go there. Be bolder, more confident, remember that you are irresistible. The man hardly pay attention to the shy girl at the disco sits quietly all night in the corner instead of dancing.
Find a reason to get to know him better. For example, if you know that he loves the films of a Director, ask him for a couple of days drive under the pretext that they themselves love this man, but I can't find the film, about which so much was heard. Your partner not only learns that you and he have common interests, but also will want to talk to you about your favourite movies. If he'll lend you the disc, look it up and be sure to share your impressions. This method almost always works, and the details depend only on the Hobbies of the guy.