It's hard and on the same time as structMonkey said. But nothing is more satisfying than carrying a (good) adc in the lane and watch him wreck people later in the game, and having him/her (well it's rare but can happen) congratulate for your plays. It's like "I CREATED THIS ADC". You feel proud :)
Even if i have Mid as main lane now, i was in previous seasons a supp main, and i have to admit i still love the most the games where you are called a "supp god", "madlife" etc etc, than any other carry role.
Because being a fighter, assasin, mage, marksman carry doesnt feel for most players as something unique, but the support carry that will make plays and literally be the main factor the team wins is the most noticeable and it feels great when you are the one doing it.
To conclude, support is a hard role, and even harder in soloq, because of the randomness you can get matched with. If you like to support frequently, grab a friend or anyone who's good at adc for duo and have fun ! (oh and ignore the "noob bot premade" if you happen to lose your lane ^_^)