My Brazilian followers, I need your help!

So, here's the thing.
"Eu te quero" means only "I want you" or can also mean "I love you", like in Spanish for example? Yes.

And what's the Portuguese equivelent for "loneliness" (or "solitude") - "solidade" or "solidão"?  sozinho, solitário, só. 

I' really appreciate your help!

I need your help, too. I want learn Pá-Russki. Can you help me? Follow me. Thanks!