Feel like ive wasted 2 years

i think a lot about life, i like to think about things in great detail, for example in class once (im in college), i was thinking about toothpaste, then i was wondering what flavours toothpaste you can get, like imagine if you could have cherry flavoured toothpaste, then i thought about wether it would have the actual nutrients of a cherry, then i made a list and a double bubble map comparing the pros and cons about eating foods to clean your teeth like imagine the possibilities, if you could eat foods and clean your teeth while gaining nutrients. i then felt a strong desire to make this a reality. i sent my idea to listorene the toothpaste brand and they got back to me explaining how they wanted me to not contact them unless i was being serious.. i then researched ever indgredient that i would use to make my toothpaste only to find that i would need to have a qualification to order some of the things that id need, so right now i dropped my art degree i was taking and am now studying chemistry and have been for 2 years, i have almost finished my first course and i was wondering if i have been wasting my time... i now feel incredibly stupid and anxious is this normal? i feel like ive wasted so much time money and hope...