In this counseling answer:
• Avoid lone contact with non-mahram females.
• If you have a strong desire to fulfill your needs that come with having a spouse, then quite simply you could seek marriage at this point.
• You may want to fast regularly to control your desires.
• Seek friendships with brothers rather than sisters.
Wa Alaikum salaam wa Rahmatullah wa barakatuh brother,
It is clear here that your friendships with these girls have caused many difficulties along the way, from affecting your friendships with others, to relations with your own family (your dad) after they found out about these relationships.
Avoid lone contact with non-mahram females
From your experience, it is possible to see how being alone with females that you are not the mahram of can cause problems. Islamically, we are advised against being in situations like this without someone else present and I think you can see why this is the case as it can cause problems.
Satisfy your needs the halal way
If you have a strong desire to fulfill your needs that come with having a spouse, then quite simply you could seek marriage at this point. Whilst not necessarily ideal since you are young and haven’t yet completed your studies, it is still possible. This way you will not be tempted to seek friendships that will not be good for you as you will be able to openly have a friendship and develop the close relationship that you desire in a halal way. Perhaps this is something you could discuss with your father.
It is said from Islamic sources that if one has desires that can only be fulfilled correctly through marriage but you are unable to get married, then you should fast as a means to control these desires.
Therefore, if it is not possible for you to marry at this point then you might consider fasting as a means to refrain from acts that are not permissible such as being alone with any of these girls. It is also a means of increasing God-consciousness which will lead you to make better decisions that will be more pleasing to Him.
Seek friendships the halal way
Keeping in mind that contact with these females is causing problems for obvious reasons at the moment, if it is not that you are seeking marriage to them then you should really avoid being with them anyway.
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However, naturally humans are social beings and we need social contact with others to remain psychologically healthy. You can obtain this by seeking friendship with others in a more permissible way, i. e. with other brothers.
Therefore, it is recommended that you seek friendships with brothers rather than sisters. You might seek such friendships in groups with shared interests, or at the local mosque for example as starting points.
May Allah guide you on the straight path and grant you a righteous spouse when the time is right.
Disclaimer: The conceptualization and recommendations stated in this response are very general and purely based on the limited information provided in the question. In no event shall AboutIslam, its counselors or employees be held liable for any damages that may arise from your decision in the use of our services.