We all started somewhere folks....
Like Shaman says..repot. I'm guessing your planting mix is too DENSE..this doesn't allow oxygen into the roots..and they can't spread out because the soil is so compacted. Go to Wally world or Casa De Pot and get a bag of perlite and mix it in with potting soil (use one with no added/timed release fertilizers in the soil!) at about 40% perlite and 60% soil and repot em up to the first leaves.
Then move the light a bit closer and give em some time to recoup before you feed em. In the meantime, find a good organic fert and avoid Miracle Gro (not knocking it if folks like it, I just think noobs burn shit with it and it causes more problems than benefits when using it)
good luck.
bt dt