Typical early life inertia.
It hits a large number of people.
Forget the clothes and physique for the time being (unless they really boost your self esteem).
Such activities are parasitic on your finite lifespan.
You just need to stop planning and anticipating things and just fall into doing things.
I'm not promoting recklessness at all but with a few obvious precautions pretend to forget that things can go wrong and just do them.
The act of walking is controlled falling if you stop to think about the process you break your stride.
Similarly if you overly plan your actions you will clog up your progress.
Gore Vidal called his autobiography Point To Point Navigation.
It's a very good way of looking at life.
Point yourself at the next thing you want to do and don't think too hard about the next stages in your journey until you have reached the first point you have aimed for.
If you are asked to speak or perform in public pretend to not care what people think.
If you are in a nightclub or a dance just move without too much self awareness.
Confidence is attractive and ignorance of limits (even faked ignorance of limits) is easily mistaken for confidence.
If you walk around with too much self awareness of your sexual history or lack of it and your perceived inability to make friends it will become a needlessly self fulfilling, self written prophecy.
Facebook should be called Fakebook it can be used as a networking tool but it can also be used as an excuse to plan things you will never do.
Do or do not, there is no if I wear this and look like that I might get somewhere with someone someday.
You are only 20 years old, you have your youth now stagger and swagger and claim your crazy prizes.