I've had to get over the same exact thing recently! My husband bought us a pair of bikes after I offhandedly mentioned that I'd like to ride...I was a little surprised when he showed up with 2 mountain bikes not long after I said that! LOL.
I was really embarrassed the first few times I rode because I had to walk up hills and I'm sure everyone could hear me breathing! Even had some girls (large girls) standing in their yard tell me to 'mush mush'...glad I was breathing too hard and exhausted or there could have been a fight! But then, ya know...I thought...I'm out here, literally working my butt off and they're standing there gabbing, drinking soda and smokings cigs (I'd JUST quit smoking the week before)....I should be telling THEM to 'mush mush'! I've passed them several times since then, not walking up hills, riding faster and stronger...and they've commented that I'm not walking! HA on them...wonder how many pounds they've gained since I've started riding?
I could never go to a gym to exercise because of the self concious factor, but biking is different! I've started not caring at all. They only see me for a few seconds. It helps that I wear sunglasses...I feel shielded from the world for some reason...lol. Odd huh?
If biking is big in your town, you'll be passed by 'roadies'. These will be skinny guys, head to toe lycra, bikes that cost more than our monthly salaries, high tech and ZOOMING. Don't let them bother you"! Chances are those guys have been biking for years! Besides, you're on a mountain bike...those knobby tires are going to slow you down! I didn't say this to discourage you...I'm trying to prepare you...lol. I watched a guy pass me and then effortlessly pedal up a hill that kicked my butt to the point that I almost stopped and turned around a few times! Then I thought it through. I wanted to throw a rock at his skinny little tires.
I went from riding for 30 minutes and being exhausted, to riding for 2 hours and feeling GREAT! In a matter of about 2 months! You can and should ride. It's a great way to get exercise without putting alot of stress on the knees and such.
The key to having a good ride is to stay hydrated, eating right, before you ride (carbs..not ALOT and not bad carbs, but like..oatmeal, something like that..healthy carbs) and not trying to push yourself. The improvements will come faster than say, starting running...
We have a biking challenge here in the exercise forum. Doesn't seem to be alot of participants, but those that do post a good bit! It's 500 miles, but no time limit. That seems very daunting, but the miles add up so quickly!
Do you have a cycle computer? I got one at Walmart for about $10 and it's great! Gives avg speed, time, mileage, high speed. It's really interesting to see your results! It's also a great motivator! To keep track of it all, I use bikejournal.com It's an amazing tool for me! To see those numbers climb just make me want to do more and more!
This is terribly long...lol..sorry, but wanted to get the point across that you CAN bike and shouldn't feel odd about doing it! Get out there and ride!
Kim