Is buying a non retina MacBook Pro 13 inch now a bad purchase? I'm starting college in August so I need a macbook now. I just don't want the macbook to get outdated quickly because I need it to last all 4 years of college.
Without knowing your budget and computing needs, it's a bit of a shot in the dark, but as you're considering a 13"MBP, we'll take that as a general guideline. I would take a good long hard look at the new 13"MBA as well. Compare it carefully, spec by spec to the 13"MBP. Price wise the Air will be a bit more, but for that, you'll have SSD storage (huge plus, imho), Haswell with
Intel5000 graphics, better screen resolution (1440x900 vs 1280x800), industry-leading battery life, and the better size/weight of that Air.
The MBP on the other hand, will give you a lower price, a faster processor (although not Haswell), an optical drive, more storage on the standard version, and upgradeability. Why not go to an APPLE store or BB, if any of those are reasonably near you, and try them both out? If you can hang on a bit longer, see what happens when the new rMBPs come out. There's that possibility the MBPs might be discontinued, so that could save you some $$.
If you want it right now, to get ready for school,
you can't go wrong with either the 13"MBP or the new 13"MBA, but my admittedly subjective, personal choice would be the new 13"MBA.