You can apply to any type of college with a GED. One of my kids is a performer and got her GED, and was admitted to all the schools she applied to.
There are other ways to get a diploma as well. Check out North Atlantic Regional High School for instance. They will compile credits and trainings and let you know what you need to finish. Homeschools sites can provide further ideas. Do you get credit for your welding training?
What you do need is some understanding of what music schools are all about. There are BM and BA programs (See the Double Degree Dilemma essay closer to the top of this forum).
It seems to me that music production, music technology, studio production (there are different terms for this area of study) might be one direction to go in. Another might be songwriting.
For an example look at Columbia College Chicago. https://www.colum.edu/ Many state schools are also possibilities.
Take a look at schools like Berklee or Miami Frost to see the areas of study and courses to clarify what you might want to do. Then find affordable ways to do this. Some schools also have continuing education where you can take courses one at a time, while you work.
Another possibility is to continue training and working in welding but finding a teacher. This could get you started. Once you are clear on the area of study you want you could try contacting a teacher in a local school or college.
Do you have anyone locally who can perform with you, or is your music basically a solo endeavor?
Good luck! Ad don’t ever think a GED will hold you back.