Welcome richtea, fantastic that you have had that light bulb moment as many of us have had on here and decided you want to change your life. I only started cycling 12 months ago, was overweight, ate the nasty foods
etc, but decided it was time to change, bought a bike and off I went, the first week I clocked up 7 miles, but that was 7 miles more than the week before, as you say 2 miles is 2 miles, just keep going at it and eventually you build up a bit each time. If you feel like setting yourself little goals than do so, the only person that matters is you and how you feel.
Since I started I have lost just over 2 stone and cycle around 50 miles over a weekend period, thats comfortable for me, I try and get a few smallish hills in as well, but if you had told me that 12 months ago when I got off the bike in my first week doing a good impersonation of John Wayne walking I'd of laughed at you.
Gaz's journey so far was also an inspiration to me and if I met you Gaz, i'd shake your hand and say thank you. Just stay with it richtea and take it day by day, week by week, etc, in few months time you will be giving advice out to the next person to come along like you. Cant say I have seen anybody on here who is judgmental about anybody, plus you will get loads of excellent advice and tips. Good luck anyway, I wish you well