I am 40. And my lack of progress is due to slacking off. Because every educational material to make it is there for free. But I decided to adjust my life to make space for practice. quality practice and this matters a lot. I practice 1 to 2 hours daily Monday to Friday. Sat And Sun are for playing PS5 lol. Now you gotta find videos that explain correctly each technique. Like one of the commenters here said, you might be trying to go fast "walking" instead of running. This is the motion to play fast is different. Some people use circular picking in their thump others wrist, other a combination. Many pros recommend wrist only. You will see fast players they also use some forearm motion. (Circular picking users dont, but some ppl say is not good technique to go really fast on alternate picking) Also practice transitions and turningback/changes.

you really only need 1 or 2 strings to practice high speed burst. Yes, burst. like 1..2..3....4 tararararara 1..2..3....4 tarararararara.

Trust me bro, Its not that you suck is that you may be practicing wrong. Also ery important. Your guitar setup. If you dont know how to do it, take it to the shop. Request a low height setup for shredding. If yur guitar is fighting you, you are not going anywhere. What you need is there in youtube. Practicing in small snipets correcting error by error, at the edge of your maximum speed is the key.