Did you originally apply to UMCP or Towson? Why was community college your only other option? You say your parents wanted you to go to Mount St. Mary's because it would be better than community college, and also for financial reasons. I assume this means you couldn't get into the state schools you wanted to go to, but you did get into other private schools that were more expensive than Mount St. Mary's.
If you were denied admittance to UMCP and Towson as a HS senior, you won't be able to transfer in until you have a decent college record until your belt, usually at least 30 credits, maybe more, with a GPA of at least 3.0. Look into transfer requirements at UMCP and Towson. My advice is to stick out the semester at Mount St. Mary's and if you still really hate it, then go to community college until you have enough credits to transfer.
(and if you don't mind, could you tell me why you hate Mount St. Mary's?)