I Have Trouble Making Decisions

I hate that i do things on impulse when my friends ask me to go out i need to say no . I know a lot of times i don’t have the money to be spending.but I’ll go anyway and I’m no longer getting a lot of days at work . Because I’ve chosen to go to school i don’t want to be a cna for the rest of my life I’m 25 years old and i feel like i have nothing to show for It . Low key feel like a failure