I dont know your club politic, but with players so young you cant have any chances .
Even a weaker team would defeat you, even a team from Bulgaria,switzerland,greece,Moldova,Cypruss etc. I understand is very nice to have youth players but in your team at least 7-8 were under 21. You can't have any chance in European Cups with that kind of players . the best is to have 6-7 players 25+, and rest of them youngers.
Anyway in this night match the performance was very very good for your team. The final score is very unfair, this is no doubt in my opinion.
With 4-5 experienced players in your team, this tie would have been a very close one. but with yougers with 0 experience no chance.