Staying Focused and Disciplined

So I’m turning 25 in two weeks and as the time gets closer I’m starting to feel like I need to get serious about my goals and things that I want to achieve. I kind of think I’m behind but not as much as I feel the need to get started. Now the issue is I try so hard to stick to my goals but I always fall off and it’s hard for me to try again or stay consistent. My sister said it could be the fear of success (which is a real thing). I just want tips or advice if any on how you guys stay focused and disciplined. I know it’s not always about motivation but you can throw that in as well. Thanks in advance 💘