Hello there. It's a most common thing for the students to think and glad to see that you are concerned with what to do in future because many without thinking choose CSE and later on are not able to achieve anything in the future.

Ok so the next thing. Yes it's quite true to say that only person interested in CSE should opt for it because without interest you won't be able to achieve what you can achieve in the field of your interest. But on other hand CSE is a field in which once you enter you will find it very interesting and your interest will start to grow automatically toward it. So it's totally your decision whether you want to choose something new or carry on the things which are already with you.

Since you are particular about the subjects, them you can opt for the option of BSc where you can study more about these subject and later on with MSc and then after that you still want to read them you can go for PHD in any particular field.

And if you want to go with CSE then go with engineering and their in first year it's totally what you have studied before in 12th and just a higher version for the concepts. Their at starting you will be having a single CSE subject which will be C Language to start building up your concepts. Once you start to take interest in that, you can easily grab all the further things. And also in CSE it's not just coding and programming. Their are various other concepts which are in high demand like web designing,  algorithms, search engine optimization digital marketing and many more such concepts so you can select any one of that for your future.