Aliens: may be friends of us?

10million years ago, there is no human 
10,000years humans born,1000years ago humans start travel,make communities and start reading writing and thinking,and 100-300 years ago hawking said that we are not alone.

We always think that what happen if aliens come, what happens if we contact with them, we always afraid of the creatures that we don't seen yet, but why don't we take it like calculation that its 50% chances s that we are aliens for them, and they are afraid of us not we, that before we reach civilization and to the rocket science , they are not born yet,

The other 50% also said that they are coming for us with ships and we are not even stand in front of them but if they are than there is also a chance of friendship or sharing of knowledge resources and exploring of world , not only war and ruling the universe (just like all the Hollywood drama movies).
We can hope of a better future not with alone but with our friends also,with a very fraction of chances of that 'they are there'
But at least we don't have to afraid that much.

But yes, we are the only one species in the world with brain and nobody wants to just vanish, that's why I think we always think the least negative chance and preparing for them for survival, for our life, and with a rose in one hand we have to prepare with a gun in pocket, not to rule or win with anyone but to survive if it happens.