For an idea of where your current ACT score of 33 would place you in relation to the profiles of highly selective colleges that have been mentioned (whether positively or not) in this topic, these are the 25th percentile levels for some of them:
Wesleyan: 30.5
Vassar: 32
Amherst: 33
Hamilton: 33
Princeton: 33
Brown: 33
Note that reporting percentages for these schools differ, and that this information is from current Common Data Sets, irrespective of the year represented.
Additionally, your ACT section scores can matter as well. Different distributions of scores may be viewed differently when comparing students with the same or similar composite scores.