I used to play out the side of my mouth for like 7 yrs --- then I moved it to the center one summer --- and basically it was a start over --- difficult, but necessary to improve.
that was years ago --- I was visiting my dad, and was talking to my Dad tonight (oh I am 45 now) -- and he was telling me when I was younger --- how awful the trumpet sounded for lots and lots of years. So I played a song for him --- and he remarked, how beautiful the sound was, and how much I learned in 30 yrs.
practice, practice, and never give up --- make the necessary adjustments - if you love the trumpet --- you will -- it will be worth it.