Is it worth it taking flying lessons even though I can't commit to regular lessons right now?
My humble advice is to take a single introductory flight in the Cessna 150 to galvanize your interest and increase your motivation. Go to ground school first and then (preferably) start your flight training (in the C150) in earnest once you have the time and money available to take lessons on a regular schedule (once a week minimum, three times a week maximum [until the later stages of your initial training -when you are practicing what you have learned and not learning new skills]).
In my experience, having too big of a gap between flight lessons can be counter-productive and make for a (sometimes) difficult learning curve.  This can lead to frustration on your part and, perhaps, result in your enthusiasm being diminished.
Frequent lessons will most quickly enhance your skills and your proficiency will improve steadily.  Additionally, recency of flight experience will provide for greater personal enjoyment and reinforce your confidence, a very important factor in learning to fly.