Using a condom makes me limp

all my previous girlfriends were on the pill, so I just rawdogged it, feels great and I'm able to stay rock hard. but since I've been in college, I don't know if random girls are on it, or if they have stds etc.

whenever I attempt to put one on, I go limp almost immediately. sometimes I can stay semi hard, and then I can feel basically nothing. its brutal.

im not sure if its a mental thing or not, because when I don't use one I f*** like a champ and have no problems being really hard, but there's something about using a condom that makes me limp. my penis is bigger than normal, but not huge so condoms also don't really fit. normal is too small and magnums are too big.

any guys have similar experience?
Using a condom makes me limp
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