hi,

no you will not face any issue in counselling, however you have 2 years gap after 12th course which is absolutely fine, since jee main exams can be attempted 3 consecutive years starting from the 12th passing years, however you will not eligible for jee advance exam since jee advance can be give 2 times, since you have passed 12th course in 2018, you could give jee advance in 2018 and 2019. however based on jee main score you are eligible to take admission in nits, iits or any other government and private colleges.