The "life has no meaning" thing is only half right.
The truth is life has no inherent meaning, and we can make of it however we wish.
You are the only one who can find your purpose.
That's obviously no excuse to over indulge and waste your life away, in fact the way I see it it's the opposite.
A good place to start is simply setting a long term goal that can be attained, and work towards it in any way you can.
That's the first step to living a happy life without regret.

joke or not, this deserves a serious answer:

it's not easy AT ALL to be happy while knowing/feeling nothing ever matters. whoever thinks that falling into dispair is just "becoming a pussy" is a goddamn idiot.

you think it's easy to get out of bed in the morining if nothing matters? why bother? why not sleep some more? at least it feels nice and numbs the feeling of emptiness.
go to work? eat healthy? try to have a productive life? why? what for? if nothing matters why should one risk the pain and effort crushing dissapoinments that these things involve?
if nothing matters why cope through the everyday pains of life, just end it all right there right now.

so yeah. people who think it's sooooo easy to just live without meaning never actually experienced anything of that sort and simply don't know shit