hello ! I'm 19 years old and I started playing bass the 12/31/2020 so almost 4 month...
I don't feel like playing better, or doing good music...
Do you mean you don't want to play music, or do you mean you don't feel like you're getting better?
If it's the first (you don't want to play music), then quit - music isn't for you if you don't like to do it.
If it's the second (you don't feel like you're making progress), then....yeah, some pointers on things would be helpful, but you should also know that music isn't necessarily easy. I've been playing music of one sort or another for 55 years, and I'm good, but I'm not a virtuoso - there is no guarantee that you'll become a stellar player in an arbitrary amount of time. Persistence and patience, no matter how you practice, is a big part of the equation.
If you don't have money for lessons, turn on the radio, or some source of tunes you can play along with, and play - I taught myself to play (I was young and poor) that way, and I've played with plenty of other people - it's a very good way to develop your ear and technique. There are people who will tell you that you need to learn theory to get anywhere. Theory can be helpful, but if what you have to contribute towards learning is just time, go ahead without theory - you can pick it up later, and in the meantime, you'll develop your ear. If you want to play with others, at some point you'll find yourself in an audition of some sort, and being able to pick out what's going on and play along is a VERY valuable skill in that setting - so work on that.
You will hit plateaus - times when it seem like you're not making progress. You need to keep at it, especially at those times, if you want to progress.
The good news is, if you want to play music, and you keep at it, you just might end up doing it for a lifetime - I still enjoy it every time I take the stage with some of my musical friends - it's always an adventure of some kind.
Good luck
