I feel this way often. I am in a similar parallel of life in most of what you have said. But, I am not as busy as you seem to be. Making that many songs and on the phone etc, takes a lot of time. I used to use "blender" until I realised the logo was a "666". I have nothing in life and not one skill. No gifts of note. And i'm getting to the age where it seems nearly all too late to continue.
I feel that all of this is addiction to "sense pleasures and worldly dreams". It is a clinging to what could be, and not to the submission to Christ and "being contented with ones lot". We want more. It is never enough. We have to learn to accept our lives are not supposed to be always fun and exciting. This is dopamine addiction and sense pleasure stimulation. This is why the phone is hard to put down and may be why you make songs, because of the "winning high" of dopamine when you accomplish something. I feel the same with all accomplishments. But this has to be directed to God in some way.
Overcoming of "strongholds" of dopamine addiction. Separation from the phone, the media, tech, forced abstinence. These however boring at first, grow a "non-boring state" of mind that does not need or stress or want to have a life "easier like I was younger" etc. We all feel this way at some point overall. It is life. We can all be happy, but not in a fallen sinful world. It has to be made new by God. Otherwise we are grasping lustfully, trying to be "of the world and in the world", when we are called to be the opposite.
But I pray the Father in Heaven, you are led to be prosperous and fulfilled in all ways, in health, wealth, spiritual things, godly things, righteous things, and wisdom, and understanding, and bold courage to do all good works set forward by God. I pray you are kept on the path with ease. In Jesus name I pray, Amen.