Firstly, as someone who has only shown her horses twice and both are horses I no longer own... I can sympathise... I have wanted to show for some time but have had legitimate issues that stopped my attempts over the last few years... however this season I will endeavour to get out to at least one with my mare, as I'm currently setting up my show kit.
Anyway, like Saskia mentioned, there are always options if you wish to do something. Look in the newspapers, over here most shows are advertised in the papers, and I'm sure that'd be the case elsewhere. Also online, local communities will be able to offer information. Check in tack/feed shops and ask your friends.
Allowing a past experience with an ex trainer/person in your life to stamp out any chance of showing isn't something you should do. And getting sad isn't helpful... rather get proactive if its something you want to do. Make plans and stick to them.
♥ Seoul Searchin' for the Lovebug ♥