Your header is probably just a turn of phrase, but please stop for a minute and re-think your question.
First of all (and don’t roll your eyes): acceptance to any college is not a referendum on how “good” you, @ch240139, are. It’s not even just how good a candidate you are: there are many, many, many people who won’t get into Tufts who are completely qualified applicants.
Tufts does an interesting exercise at it’s road show, using anonymized profiles of real candidates from the previous admissions cycle. In the exercise they are down to the last place in the class, and it’s down to about 6 candidates. The audience is given facts about the applicants and then asked to vote who they would accept. The first round is stats: GPA / test scores, and there was a clear winner and runner up. The next rounds go through LoR, essays, ECs and interview. Over the sections the balance of votes starts to shift from the early front runners to some dark horses. At the end they tell you which one was admitted (and also the 2 who were waitlisted). What was striking was that (even if you didn’t completely agree) the decisions made sense. Obviously, this is a prepared exercise, to show applicants & parents the kind of process the AdComm works through, but it was also clear that they do look at the student as a whole and in the context of Tufts.
If there’s an interview, take it: they rarely make much of a difference, but it shows interest and it gives you a chance to learn more.
Avoid score-keeping in your application: 5 leadership positions isn’t an end itself. What matters is what they are, what they mean to you and what they show about you. One leadership position can be more powerful a statement about you than 10- if it’s substantive and fits into your overall story of you.
And: be sure that you know why you want Tufts: what are the pieces that make you feel as if that is just the right place for you? Do what you can to be sure that your idea of Tufts and the reality of Tufts match. I know a surprising number of students who thought that it would be ideal for them, but felt differently after spending time there. That’s not to be negative about Tufts (I also know students who are very happy there), just that it is more of a ‘fit’ school than some people realize. Spend the summer looking for other colleges (of varying degree of selectivity) that have the features you are looking for, so that you have good choices in the spring.
And know that whatever happens in the admissions process, it is not a judgement on whether you are good enough.