How do we forgive ourselves for all of the things we did not become?

So I'm thinking.... Why can't we have everything, why?

we are having this kind of relationship; 

im having bad conscience; 

what do i do? 

i like you; you make me feel like i can actually fall in love again; falling in love again with you deeply;

but this is not real;

i dont want it to be real;

i am always the pessimistic one, remember?