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There is no requirement to prove your address. What is mandatory is confirmation of legal residence, if you are not a national of the country in which you are applying or your right to reside there is not included in your passport. The Guide to Supporting Documrnts https://www.gov.uk/government/publications/visitor-visa-guide-to-supporting-documents/guide-to-supporting-documents-visiting-the-uk makes no mention of proof of address being needed.
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Supply proof of your present residence and proof of your collage attendance for that period with the statement that you lived the in a college dorm during that time
Important is only that truthful answers be given and documented with present documents available.