People see you in the way you represent yourself in terms of behavior ,emotions ,self-confidence ,attitude ,openness.
If you see yourself as not glamorous ,that is how you will represent yourself and that is how people will see you too .
You project your inner state through magic, if your intent does not agree with your real emotional state of being you simply will waste your time .Change starts inwards and only then can be projected outwards .You can not pump the illusion that you are cool if you do not believe that you are .And the reason why you are here seeking advice in this particular field suggests that you do not really see yourself this way .
Start from working on self love and acceptance .Try to empower yourself through small changes and affirmations .The mirror can be your friend and help you visualize the better you ,once you see the target you will be enough motivated to strive for it .
Whatever you do give your best and keep improving .