With a good quality microphone and table it sounds terrible. Help

[J.Angelo solista]

Hi, I'm from Spain, I use translator. I've been singing for a week with my equipment which I know sounds good anywhere but with Smule. It's a 300€ AKG D7 dynamic microphone and a Behringer QX1204USB mixer, Samsung Flip5 phone.
It sounds horrible. 
Someone who has an interface that sounds really good tell me what I should buy to make it sound professional quality.
Please help.
Thank you.

[J.Angelo solista]

I add that the Samsung phone is a Flip5.

Two very good quality speakers, €300 each, are also connected to the mixing board.

And either I don't get the best confirmation or I don't do something right, because I hear myself very badly.

[J.Angelo solista]

Add that the Samsung phone is a Flip5.

Also connected to the mixer are two very good quality speakers, 300€ each.

And either I don't have the best confirmation or I'm not doing something right, because I sound very bad.

[opentype]

Can you link a Smule song recorded with this equipment? 

[J.Angelo solista]

The problem is the voice that sounds bad. The music good.

[opentype]

Are you sure the microphone is even working and that you are not using the internal microphone of the phone?

[J.Angelo solista]

Totally sure. 

[J.Angelo solista]

have already verified that the solution is to find the FX according to each song and your voice