I have deep desire to study Physics after I graduate from Computer Engineering; want to know if I have what it takes to be successful in this field I am now studying Computer Application, a bachelor degree in India. I can get a job in the IT sector if I try only a little harder. But I have this deep desire to study Physics starting from undergraduate. 

My high school science scores were average. I consider myself as a smart working science student. I want to apply in UK colleges as there I can start from bachelor degree even if I already have one. I study Physics whenever I get time apart from my present course preparation.   But, I have this depressing and demeaning feeling within me that I shall not be able to cope up with Physics, I shall fail and that I don't belong to that field. 

I want to know how can I be finally sure whether I have what it takes to study Physics. So that either I can finally remove this desire of Physics from my head and concentrate on Computer/IT jobs or prepare myself for another field of education that I think will best fit me. How can I assess myself? 

It's private to me, so I don't want to ask anyone close to me. Not even my almost-a-physicist brother. I struggle a bit at solving deep thinking problems. I am slow at math but I don't give up. Often it makes me cry, but the next day I'm again after it. And I don't think I shall be happy in the IT sector.
Answer from a physicists. Please make an effort to define what it means to "belong to the field of physics".  


Do you have what it takes to get a bachelor in physics? Sure you do: if you can graduate in another STEM field as computer engineering you can graduate in physics as well. Physics is hard, but with good math skills, and lots of passion this is certainly not an insurmountable challenge.
Do you have what it takes to get a master in physics? Pretty much same as above. If you still like it after 3 years you can certainly put one or two more. If anything, master is easier as you are already through the first barrier (having the proper mindset)
do you have what it takes to obtain a PhD in physics? If you got till here, then the question is more about attitude: can you on work for long hours, many days a week toward a very hard, possibly ill defined problem, for years? This is a skill you develop in any PhD
do you have what it takes to become a physicist? (physicist = an person that does research in physics for a living, typically in universities or laboratories) It takes a person with a PhD who can prove he/she is creative, relentless, ambitious, can get papers published and money grant flowing, and face extreme competition without crushing under pressure. At this stage, it takes exeptional hard and soft skills, and a good dose of luck.


I think you were referring to the bachelor. Go for it, follow your passion. Are you not sure you want to become an academic? Most physics graduates I know who left the field are now working as quant traders, data scientists, entrepreneurs, journalists, teachers, politicians. Not too bad if you think you would not make for a good academic, right? :)