Carlos, your music is beautiful and I'm sure that if you keep going you'll get someone to pick you up.
I wonder if the demos you send don't sell the studios on you because they don't "sound" like what the studio is looking for (despite the quality of the composition). By that I mean a couple things:
1. Not many games have a soundtrack orchestrated traditionally (even Jeremy Soule uses big, huge epic drums to hook people into the Skyrim theme). Many either go "modern/hybrid/epic" like this:
with orchestral components, but also synths, guitars, and other instruments. Sometimes they are purely chiptune:
or a million other styles. But game soundtracks aren't often just orchestra. Maybe you could try learning how to use synths or have someone "orchestrate" your compositions on synths? Obviously you are a solid composer, maybe you're just not using the right sonic palette to get the studios' attention.
2. The structure of your pieces are also not very similar to video game music IMO. They are beautiful and more complex than a lot of VG music is (they don't loop, for example). Maybe try writing some very simple pieces that can be looped. There's nothing wrong with simple, looping music with only a few voices; it can be great:
I haven't worked professionally, these are just some thoughts of mine.