Don't ask a colleague every time you don't know how to do something. Investigate, learn how to debug. Building intuition is what's going to take you to the next level. Also, try to not get stuck with same tools for too long.
To bounce off of this point - be sure to figure out the right time to ask questions. I'm currently a junior programmer and I've been struggling with this myself. Obviously, you shouldn't ask a coworker a question the moment you don't know how to do something, but you also shouldn't be stuck on something for a week without asking for help. It's all about balance.