I wished to transfer BTC, and i found that for sending 0.0020 I have to pay 0.0030 as transaction fee
¿how it is possible?

Well, I'll translate from english to spanish for BTC. I'm thinking specially in apps and websites. Its one of the most spoken languages in the world!

I'm new at the forum, so  if you have some reputation here, I will deliver the work before being paid.

Small translations will have small prices. Don't be shy and ask.