I guess that you mean standard chess OTB FIDE rating? Then the answer to your question will depend on wether your are a relatively better/worse rapid/blitz-player compared by standard OTB chess.
If your OTB experience is limited your should also count on some losses in the learning proces (OTB and online chess are quite different experiences).
Regardless of this your should expect the chess.com ratings (provided that they are stable and besed on a relatively big sample of games) to be 100-300 point higher than your expected FIDE rating level.
So yes. It should be realistic. You may already be able to hit this rating, but probably you will have to work a bit (getting experience + improving your play a bit).
I am rated 1900 rapid, 1800 blitz on this website. How hard it is for me to reach 1800 FIDE? How much work would I have to put in and how realistic reaching 1800 FIDE is in the first place?
I am in my 20s. I started playing chess 3 years ago. I sometimes analysed my games and I watched a lot of chess content on youtube and that's how I reached my current strength level.