Unis will take extenuating circumstances into account. And don't worry about everyone else's expectations- it's your life, and where you choose to take it is up to you. Perhaps talk through your worries with people you are scared of disappointing, and as for being scared of disappointing yourself, don't be! You still have a chance to turn things around even if your AS results don't go as planned- resits or even a 3rd year would not rule you out on Uni, especially if you prove your dedication with everything else that makes up a great application- work experience, wider reading, etc. I'm sorry to hear you had such a tough year, but you can get through it and everything will work out better than you think.