I my hole is small should I try butt plug?
If you feel the inclination to do so, then you should.
But of course, start small, with small narrow plugs that can be slipped up into you with little discomfort. And keep it in for short periods at first until you get used to it. Then you can go to progressively larger sized plugs.
That is how I started. My gf once cut my interior anal muscles with a sharp fingernail when we were first together. It hurt like hell, but of course healed.
Even so, so 50 years later I can still feel the scar inside. Therefore when I started with plugs back in the 1980s, I ended up making my own out of heavily varnished wood. This because those for sale in sex shops, were really too wide for me. They really hurt.
But, starting with a ridiculously small and thin home-made plug (so small I now have to laugh how dainty it looked) I increased the size over time until I could accommodate store bought plugs.
You will probably be able to use plugs, but start out small and be patient. Don't rush things. And by that I am talking about periods measured in months.
And just like in any training regimen, keep at it regularly.