I can't say if you are too idealistic or not. You would have to judge that. But if you are, you come by it honestly, astrologically speaking. Your natal Jupiter is in its dignify in Sagittarius, and also rules your Ascendant. It is also in your 1st house using traditional Whole Sign Houses.
I suppose it you are really not conscious of if you are too idealistic or not, then perhaps your Jup is in the 12th. But I would say Jup in Sag is a key factor, being associated with expansiveness, optimism, generosity. You may tend to swing back and forth between optimism and pessimism, breaking boundaries and falling back in to form, since Jupiter applies to square Saturn, creator of form and foundation. It may be that your Saturn judges your Jupiter way too idealistic at times?