Just stop! Stop caring what others think of you. Stop caring about some shameful moments that happened to you in the past. Stop being afraid of future.
Stop caring about the way you look. Stop trying to control everyone. Stop trying to control everything.
Don't overestimate past and don' underestimate present.
Stop giving a fuck what some guy told you few days ago...or even few years.
Stop making things complicated: for others and for yourself.
Better - start!
Start focusing on you and your actions. Start living in the present. Start enjoying it. Start taking actions: this is the best cure to curb the future and to overcome past. Start preparing and doing instead of imagining and planning. Start taking risks and do your best.
Stop waiting - start it now!