I've got 58 marks in general category, will I be eligible to get admission in any NIT?

Predict the engineering colleges you can get on the basis of your JEE Rank. Use Shiksha JEE College Predictor: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993

You're not eligible for NITs or IITs. You can get colleges of your state, may be government colleges. Try JEE Mains college predictor to get more information and insight about college which you can get on the basis of your rank: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?