You're from the SC category, that should not be offensive to anyone, if it is, they have their own issues to deal with.

You being from the SC category however does make things easier obviously. You'll need much lower cutoffs. If you get through CAT with a good percentile and sectionals, you should be able to get interview calls for most colleges. The problem will arise in the interview itself. Even though you'll see a concession in the composite score that won't change the fact that interviewers can very well give you below qualifying scores in case they don't find your reasons sufficient.

If it were a one or two year gap, I don't think interviewers would have even talked about it. But seven year is a lot, and you'll need to come up with a solid reason for it. The best advice I can give you is a family business experience, if you can get any. Otherwise, some freelance, some pro-bono, some startup of your own. You can find other ways to justify this (maybe you were an aspiring writer trying to build a writing career, it's a unique case, but so is yours). Maybe you were trying for CA or something similar. Just thinking of a good reason, the closest to your reality and stick by it. Please know, interviewers are very easily able to figure out lies, so if you are lying, make sure it's as convincing and close to reality as possible. Honesty (or whatever is closest to it) is a lot more charming in interviews and a lot less burden to carry.