This is coming f/ a 4 year HC point of view:
Committing and Signing are two different things. Which did you do? It does not matter in terms of you being eligible to run at the JUCO do to the governing bodies are different. I am just curious as signing seems to be a stronger form of commitment.
Are you walking on - is that why you committed? Or, do you have a scholarship to run? If you have a really good scholarship - which sounds like you do not - I would stick w/ the 4 year school.
Here are some things to consider from my experience of signing about 10 JUCO runners to my 4 year school the past 6 years.
The 4 year schools are there to make money. They will not accept all your JUCO credits. If they did, 85% of the students coming out of HS would go to a JUCO. You can pretty much count on entering your 4 year school in 2 years with Junior eligibility but as an incoming Soph academically. Most of my JUCO runners took 5 years total to graduate, I think 1 did it in 4.5 years, zero did it in 4 years. Remember, that 5th year you will not be on a scholarship so you will be paying out of pocket at the 4 year school - unless you redshirt your 4th year - see below.
Will you save money? Maybe? If you are paying all 4 years at the 4 year you will save money by going the JUCO route. If you are getting a good scholarship - you will lose money going to the JUCO. You will graduate in 4 years at the 4 year - that 5th year you will not be paying for school and hopefully in the work force earning money.
There is a chance, it only happened to 2 out of my 10 runners I had, that you will be ineligible your 4th year. You need to be making progress towards a degree. If the 4 year does not accept many of your credits, you will be deemed ineligible by the NCAA or NAIA - they do not like Senior elig. runners who are Soph academically.
I could go on all day - why don't you answer these questions - and then I and others on this board will guide you in the right direction
a) How much does it cost to attend the 4 year school - everything
b) how much scholarship money are you getting
c) what will it cost to attend the JUCO including your scholarship
Lastly, some JUCO's are great and put there runners in classes that will transfer. Some transcripts I see are a joke - oared with PE classes to keep them Elig. and they cannot get into any 4 year school. Take legitimate college classes if you are going to the JUCO -
My best advice, after two years at the JUCO - make sure your JUCO transcript is evaluated by the 4 year school before you sign with them. Get in writing how many classes / hours are transferring - good luck