Release from Various Vows

A few days ago, I took upon myself that until a certain date, if I fail, God forbid, to pray with a minyan, I would have to fast for a day within three days, and I intended that the fast would be from dawn until nightfall. I also intended (though I did not explicitly state this, but if you had asked me at the time of acceptance what my intention was, I would likely have answered that this was my intention) to fast without accepting the fast at Mincha before it, etc., but simply to refrain from eating and drinking for the day, and it is almost clear to me that I did not say at the time of acceptance "without a vow." Unfortunately, I indeed prayed not with a minyan two days ago, do I indeed need to fast? And this is also a question for the future, if, God forbid, it happens again that I do not pray with a minyan, will I need to fast? Also, a few days ago, I took upon myself that until a certain date I need to study at least five pages of Gemara with Rashi's commentary with certain reviews every day, and if I do not do so, I would have to abstain from sweets and the like for three days within two weeks, and now I regret this [since I changed my mind, and I now want to study Mishnah for a few weeks, and only afterward study a lot of Gemara], and I have already not studied the pages for a few days (it seems even before I changed my mind regarding studying Mishnah), do I indeed need to abstain from sweets and the like for many days, and if so, how do I calculate this, since within two weeks there are only 14 days, and that is not enough days to have 3 days for each day I did not study the pages? Thank you very much in advance.

Hello Rabbi

The prohibition of a vow is severe. As you can see, once you start with vows, many complications arise.

You should perform a release from vows and annul the vow from the outset.

And do not return to making vows in any form.