If you have 2200 rating online but fide rating 1500 it is normal because majority online player cannot play chess....
You can't possibly know that. I play online simply because I'm too old now for OTB - I just can't cope any more with a 3 or 4 hour playing session, my brain starts shutting down after about two and a half hours.
I can assure you, this does not mean that I "cannot play chess".
I'm curious; why is that your goal and how does it fit in with other aspects of your life? For what it's worth I think it is theoretically possible, but a lot depends on the answer to the above as to whether it is practical or sensible to aim for it in your individual circumstances.