How do I know if my business idea is actually good or if I am just excited about it?

Your excitement is not evidence, and it is not the enemy either; it is fuel that also blinds you. The fix is to route the idea through a process that does not care how you feel. Scoring forces the three questions excitement skips: do enough people have this problem (demand), can you win against what already exists (competition), and will anyone actually pay (monetization). A high score on all three is a signal; a great story is not.

Deliberately try to kill it. Use the "attack my idea" prompt from the business-idea-prompts guide to have a model argue the bear case: why customers will not switch, why the price is too high, why a bigger player crushes you. The assumption that makes you most uncomfortable to defend is usually the one to test first. This is cheaper than learning it from the market after you have built.

Replace opinion with the smallest real transaction. The strongest validation is someone outside your circle paying, pre-ordering, or putting down a deposit; the next best is a specific person saying "take my money" for a defined offer. Landing pages, waitlists, and cold outreach all beat asking friends whether they like it, because friends validate you, not the idea.

Give it a verdict and a deadline. Score it, attack it, run one paid test in two to four weeks, and decide. Ideas in our bank with clear recurring buyers score highest precisely because demand and monetization are already answered; hold your own idea to that same bar.