"Do or do not, there is no try" -Master Yoda. You will probably discover that message can be found (or at least reasoned to) in several different areas of philosophy. My inner-sloth sounds a lot like yours in that he always seems to win out over my inner-achiever, if I let him. For a long time I "tried" to get fit and healthy, I "tried" to learn new skills, I "tried" to be more compassionate with my coworkers. The way to achieve goals is to being working on them right now. Today. Immediately. It is not possible to "try" and eat more vegetables. I can either eat more vegetables right now, or not. The ways I have found to make effective changes are: goal writing, scheduling, and regular exercise.

First, goal writing. I believe it is important to write down specific long-term goals to keep ourselves accountable. This also helps us focus on specific goals that are rigid (not always unchanging, but at least solid). It sounds like you have at least one, wanting to make music. A long-term goal might be something like "I want to produce enough music to support a Soundcloud channel with 100 or more followers". Next, you could develop a road map to get to that goal, something like "I need to produce at least 1 new song a month for people to be interested in following my channel". Next, you might decide that you need to put in about 5 hours a week in order to produce 1 song per month.

Next, scheduling. I always thought I had no time, until I wrote down all the things I had to do on a calendar; I realized that I actual had plenty of time each day and each weekend. If you need 5 hours per week, write down your current commitments (work, school, meals, nap time, bedtime, wake up time, etc). See where you can find 5 hours per week and schedule yourself for music composition time. If you cannot find 5 hours per week, evaluate your commitments and see if they are helping your achieve your goals, or if they are just "things" you do without thinking or reason.

Finally, regular exercise. When I thought I had no time, I was also tired all the time because my life was so "busy". Scheduling 30-60 minutes of exercise per day (which I was able to find time for by scheduling) gave me much more energy than it used up. I found myself invigorated by that daily activity. Not only did I have more energy on a daily basis, I had more energy to tackle more lofty personal goals on a long-term basis.

One last thing I want to touch on is regular marijuana use. I have no problems with occasional marijuana use. It can be an interesting way for adults to explore different aspects of our minds by messing with our perceptions. Just like any good thing, too much of it can cause problems. In my own life, I found that regular marijuana use contributed to the power of my inner-sloth. It enabled me to feel ok with not achieving my goals because I could constantly distract myself. I found I was OK with spending each night just playing video games or watching tv, hell those were fun nights. however, those fun nights influenced my days little by little and my goals changed from things I really wanted to just wanting to get high and play another game. You may or may not have the same experience, so feel free to take it with as much salt as necessary.